US20170022138A1 - Butyl-bridged diphosphine ligands for alkoxycarbonylation - Google Patents
Butyl-bridged diphosphine ligands for alkoxycarbonylation Download PDFInfo
- Publication number
- US20170022138A1 US20170022138A1 US15/213,444 US201615213444A US2017022138A1 US 20170022138 A1 US20170022138 A1 US 20170022138A1 US 201615213444 A US201615213444 A US 201615213444A US 2017022138 A1 US2017022138 A1 US 2017022138A1
- Authority
- US
- United States
- Prior art keywords
- alkyl
- cycloalkyl
- heteroaryl
- aryl
- heterocycloalkyl
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 238000007083 alkoxycarbonylation reaction Methods 0.000 title claims abstract description 18
- 239000003446 ligand Substances 0.000 title abstract description 25
- VURFVHCLMJOLKN-UHFFFAOYSA-N diphosphane Chemical compound PP VURFVHCLMJOLKN-UHFFFAOYSA-N 0.000 title description 13
- 150000001875 compounds Chemical class 0.000 claims abstract description 64
- 125000001424 substituent group Chemical group 0.000 claims abstract description 14
- 150000002367 halogens Chemical class 0.000 claims abstract description 10
- 125000004400 (C1-C12) alkyl group Chemical group 0.000 claims abstract description 9
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims abstract description 9
- 229910052736 halogen Inorganic materials 0.000 claims abstract description 7
- 229910006069 SO3H Inorganic materials 0.000 claims abstract description 6
- -1 heteroaryl radical Chemical class 0.000 claims description 81
- 238000000034 method Methods 0.000 claims description 56
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 39
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 36
- 125000004432 carbon atom Chemical group C* 0.000 claims description 36
- KDLHZDBZIXYQEI-UHFFFAOYSA-N palladium Substances [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims description 31
- 239000000203 mixture Substances 0.000 claims description 29
- 150000003254 radicals Chemical class 0.000 claims description 28
- 238000006243 chemical reaction Methods 0.000 claims description 23
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 claims description 20
- 229910052763 palladium Inorganic materials 0.000 claims description 17
- 150000002148 esters Chemical class 0.000 claims description 15
- VQTUBCCKSQIDNK-UHFFFAOYSA-N Isobutene Chemical compound CC(C)=C VQTUBCCKSQIDNK-UHFFFAOYSA-N 0.000 claims description 12
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 claims description 12
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 claims description 12
- KWKAKUADMBZCLK-UHFFFAOYSA-N 1-octene Chemical compound CCCCCCC=C KWKAKUADMBZCLK-UHFFFAOYSA-N 0.000 claims description 10
- IAQRGUVFOMOMEM-ARJAWSKDSA-N cis-but-2-ene Chemical compound C\C=C/C IAQRGUVFOMOMEM-ARJAWSKDSA-N 0.000 claims description 10
- IAQRGUVFOMOMEM-ONEGZZNKSA-N trans-but-2-ene Chemical compound C\C=C\C IAQRGUVFOMOMEM-ONEGZZNKSA-N 0.000 claims description 10
- BKOOMYPCSUNDGP-UHFFFAOYSA-N 2-methylbut-2-ene Chemical compound CC=C(C)C BKOOMYPCSUNDGP-UHFFFAOYSA-N 0.000 claims description 8
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 claims description 8
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 8
- AMQJEAYHLZJPGS-UHFFFAOYSA-N N-Pentanol Chemical compound CCCCCO AMQJEAYHLZJPGS-UHFFFAOYSA-N 0.000 claims description 8
- QQONPFPTGQHPMA-UHFFFAOYSA-N Propene Chemical compound CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 claims description 8
- ZSIAUFGUXNUGDI-UHFFFAOYSA-N hexan-1-ol Chemical compound CCCCCCO ZSIAUFGUXNUGDI-UHFFFAOYSA-N 0.000 claims description 8
- JKDRQYIYVJVOPF-FDGPNNRMSA-L palladium(ii) acetylacetonate Chemical compound [Pd+2].C\C([O-])=C\C(C)=O.C\C([O-])=C\C(C)=O JKDRQYIYVJVOPF-FDGPNNRMSA-L 0.000 claims description 8
- YWAKXRMUMFPDSH-UHFFFAOYSA-N pentene Chemical compound CCCC=C YWAKXRMUMFPDSH-UHFFFAOYSA-N 0.000 claims description 8
- 125000000524 functional group Chemical group 0.000 claims description 7
- WGLLSSPDPJPLOR-UHFFFAOYSA-N 2,3-dimethylbut-2-ene Chemical group CC(C)=C(C)C WGLLSSPDPJPLOR-UHFFFAOYSA-N 0.000 claims description 6
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 6
- AQIXEPGDORPWBJ-UHFFFAOYSA-N pentan-3-ol Chemical compound CCC(O)CC AQIXEPGDORPWBJ-UHFFFAOYSA-N 0.000 claims description 6
- 125000004076 pyridyl group Chemical group 0.000 claims description 6
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 5
- 125000003118 aryl group Chemical group 0.000 claims description 5
- 125000002541 furyl group Chemical group 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 5
- QMMOXUPEWRXHJS-UHFFFAOYSA-N pentene-2 Natural products CCC=CC QMMOXUPEWRXHJS-UHFFFAOYSA-N 0.000 claims description 5
- 239000011541 reaction mixture Substances 0.000 claims description 5
- MHNNAWXXUZQSNM-UHFFFAOYSA-N 2-methylbut-1-ene Chemical compound CCC(C)=C MHNNAWXXUZQSNM-UHFFFAOYSA-N 0.000 claims description 4
- 125000002883 imidazolyl group Chemical group 0.000 claims description 4
- 125000001041 indolyl group Chemical group 0.000 claims description 4
- ZGEGCLOFRBLKSE-UHFFFAOYSA-N methylene hexane Natural products CCCCCC=C ZGEGCLOFRBLKSE-UHFFFAOYSA-N 0.000 claims description 4
- PIBWKRNGBLPSSY-UHFFFAOYSA-L palladium(II) chloride Chemical compound Cl[Pd]Cl PIBWKRNGBLPSSY-UHFFFAOYSA-L 0.000 claims description 4
- YJVFFLUZDVXJQI-UHFFFAOYSA-L palladium(ii) acetate Chemical compound [Pd+2].CC([O-])=O.CC([O-])=O YJVFFLUZDVXJQI-UHFFFAOYSA-L 0.000 claims description 4
- 125000000714 pyrimidinyl group Chemical group 0.000 claims description 4
- 125000000168 pyrrolyl group Chemical group 0.000 claims description 4
- 125000001544 thienyl group Chemical group 0.000 claims description 4
- QMMOXUPEWRXHJS-HWKANZROSA-N (e)-pent-2-ene Chemical compound CC\C=C\C QMMOXUPEWRXHJS-HWKANZROSA-N 0.000 claims description 3
- QMMOXUPEWRXHJS-HYXAFXHYSA-N (z)-pent-2-ene Chemical compound CC\C=C/C QMMOXUPEWRXHJS-HYXAFXHYSA-N 0.000 claims description 3
- ILPBINAXDRFYPL-UHFFFAOYSA-N 2-octene Chemical compound CCCCCC=CC ILPBINAXDRFYPL-UHFFFAOYSA-N 0.000 claims description 3
- YHQXBTXEYZIYOV-UHFFFAOYSA-N 3-methylbut-1-ene Chemical compound CC(C)C=C YHQXBTXEYZIYOV-UHFFFAOYSA-N 0.000 claims description 3
- 125000003785 benzimidazolyl group Chemical group N1=C(NC2=C1C=CC=C2)* 0.000 claims description 3
- 125000000499 benzofuranyl group Chemical group O1C(=CC2=C1C=CC=C2)* 0.000 claims description 3
- 125000003917 carbamoyl group Chemical group [H]N([H])C(*)=O 0.000 claims description 3
- 150000001244 carboxylic acid anhydrides Chemical class 0.000 claims description 3
- 150000001733 carboxylic acid esters Chemical class 0.000 claims description 3
- 238000006555 catalytic reaction Methods 0.000 claims description 3
- HPXRVTGHNJAIIH-UHFFFAOYSA-N cyclohexanol Chemical compound OC1CCCCC1 HPXRVTGHNJAIIH-UHFFFAOYSA-N 0.000 claims description 3
- 125000003838 furazanyl group Chemical group 0.000 claims description 3
- 125000001072 heteroaryl group Chemical group 0.000 claims description 3
- 150000003949 imides Chemical class 0.000 claims description 3
- 125000000904 isoindolyl group Chemical group C=1(NC=C2C=CC=CC12)* 0.000 claims description 3
- 125000005956 isoquinolyl group Chemical group 0.000 claims description 3
- 125000001786 isothiazolyl group Chemical group 0.000 claims description 3
- 125000000842 isoxazolyl group Chemical group 0.000 claims description 3
- TVMXDCGIABBOFY-UHFFFAOYSA-N n-Octanol Natural products CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 claims description 3
- SBOJXQVPLKSXOG-UHFFFAOYSA-N o-amino-hydroxylamine Chemical compound NON SBOJXQVPLKSXOG-UHFFFAOYSA-N 0.000 claims description 3
- 125000002971 oxazolyl group Chemical group 0.000 claims description 3
- 125000003373 pyrazinyl group Chemical group 0.000 claims description 3
- 125000003226 pyrazolyl group Chemical group 0.000 claims description 3
- 125000002098 pyridazinyl group Chemical group 0.000 claims description 3
- 125000005493 quinolyl group Chemical group 0.000 claims description 3
- 125000003808 silyl group Chemical group [H][Si]([H])([H])[*] 0.000 claims description 3
- 125000003831 tetrazolyl group Chemical group 0.000 claims description 3
- 125000000335 thiazolyl group Chemical group 0.000 claims description 3
- 125000002813 thiocarbonyl group Chemical group *C(*)=S 0.000 claims description 3
- 150000003568 thioethers Chemical class 0.000 claims description 3
- UKSZBOKPHAQOMP-SVLSSHOZSA-N (1e,4e)-1,5-diphenylpenta-1,4-dien-3-one;palladium Chemical compound [Pd].C=1C=CC=CC=1\C=C\C(=O)\C=C\C1=CC=CC=C1.C=1C=CC=CC=1\C=C\C(=O)\C=C\C1=CC=CC=C1 UKSZBOKPHAQOMP-SVLSSHOZSA-N 0.000 claims description 2
- RRHPTXZOMDSKRS-PHFPKPIQSA-L (1z,5z)-cycloocta-1,5-diene;dichloropalladium Chemical compound Cl[Pd]Cl.C\1C\C=C/CC\C=C/1 RRHPTXZOMDSKRS-PHFPKPIQSA-L 0.000 claims description 2
- LIKMAJRDDDTEIG-UHFFFAOYSA-N 1-hexene Chemical compound CCCCC=C LIKMAJRDDDTEIG-UHFFFAOYSA-N 0.000 claims description 2
- RBYGDVHOECIAFC-UHFFFAOYSA-L acetonitrile;palladium(2+);dichloride Chemical compound [Cl-].[Cl-].[Pd+2].CC#N.CC#N RBYGDVHOECIAFC-UHFFFAOYSA-L 0.000 claims description 2
- 125000000490 cinnamyl group Chemical group C(C=CC1=CC=CC=C1)* 0.000 claims description 2
- LXNAVEXFUKBNMK-UHFFFAOYSA-N palladium(II) acetate Substances [Pd].CC(O)=O.CC(O)=O LXNAVEXFUKBNMK-UHFFFAOYSA-N 0.000 claims description 2
- 239000000243 solution Substances 0.000 description 40
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 34
- 150000001336 alkenes Chemical class 0.000 description 23
- UHOVQNZJYSORNB-MZWXYZOWSA-N benzene-d6 Chemical compound [2H]C1=C([2H])C([2H])=C([2H])C([2H])=C1[2H] UHOVQNZJYSORNB-MZWXYZOWSA-N 0.000 description 19
- UORVGPXVDQYIDP-UHFFFAOYSA-N borane Chemical compound B UORVGPXVDQYIDP-UHFFFAOYSA-N 0.000 description 17
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 17
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 16
- 239000002253 acid Substances 0.000 description 15
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 14
- 239000007787 solid Substances 0.000 description 13
- JOXIMZWYDAKGHI-UHFFFAOYSA-N toluene-4-sulfonic acid Chemical compound CC1=CC=C(S(O)(=O)=O)C=C1 JOXIMZWYDAKGHI-UHFFFAOYSA-N 0.000 description 13
- HEDRZPFGACZZDS-MICDWDOJSA-N Trichloro(2H)methane Chemical compound [2H]C(Cl)(Cl)Cl HEDRZPFGACZZDS-MICDWDOJSA-N 0.000 description 12
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 10
- 229910000085 borane Inorganic materials 0.000 description 10
- 229910052757 nitrogen Inorganic materials 0.000 description 10
- 239000000047 product Substances 0.000 description 10
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 9
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 9
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 description 8
- 238000002474 experimental method Methods 0.000 description 8
- 125000006413 ring segment Chemical group 0.000 description 8
- 238000004679 31P NMR spectroscopy Methods 0.000 description 7
- 0 [1*]P([2*])CCCCP([3*])[4*] Chemical compound [1*]P([2*])CCCCP([3*])[4*] 0.000 description 7
- 239000003054 catalyst Substances 0.000 description 7
- 125000005842 heteroatom Chemical group 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical class CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 7
- 238000002360 preparation method Methods 0.000 description 7
- 239000002904 solvent Substances 0.000 description 7
- 238000001644 13C nuclear magnetic resonance spectroscopy Methods 0.000 description 6
- 238000005160 1H NMR spectroscopy Methods 0.000 description 6
- XYFCBTPGUUZFHI-UHFFFAOYSA-N Phosphine Chemical compound P XYFCBTPGUUZFHI-UHFFFAOYSA-N 0.000 description 6
- RWRDLPDLKQPQOW-UHFFFAOYSA-N Pyrrolidine Chemical compound C1CCNC1 RWRDLPDLKQPQOW-UHFFFAOYSA-N 0.000 description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 230000003197 catalytic effect Effects 0.000 description 6
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 5
- 150000007513 acids Chemical class 0.000 description 5
- 229910052786 argon Inorganic materials 0.000 description 5
- 239000011521 glass Substances 0.000 description 5
- 238000006063 methoxycarbonylation reaction Methods 0.000 description 5
- 239000002244 precipitate Substances 0.000 description 5
- 238000003756 stirring Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 125000006652 (C3-C12) cycloalkyl group Chemical group 0.000 description 4
- 125000006707 (C3-C12) heterocycloalkyl group Chemical group 0.000 description 4
- 125000004105 2-pyridyl group Chemical group N1=C([*])C([H])=C([H])C([H])=C1[H] 0.000 description 4
- RRHGJUQNOFWUDK-UHFFFAOYSA-N Isoprene Chemical compound CC(=C)C=C RRHGJUQNOFWUDK-UHFFFAOYSA-N 0.000 description 4
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 4
- DKGAVHZHDRPRBM-UHFFFAOYSA-N Tert-Butanol Chemical compound CC(C)(C)O DKGAVHZHDRPRBM-UHFFFAOYSA-N 0.000 description 4
- RRRZOLBZYZWQBZ-UHFFFAOYSA-N bis(1-adamantyl)phosphane Chemical compound C1C(C2)CC(C3)CC2CC13PC(C1)(C2)CC3CC2CC1C3 RRRZOLBZYZWQBZ-UHFFFAOYSA-N 0.000 description 4
- 239000000460 chlorine Substances 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 125000004122 cyclic group Chemical group 0.000 description 4
- 238000004817 gas chromatography Methods 0.000 description 4
- NNPPMTNAJDCUHE-UHFFFAOYSA-N isobutane Chemical compound CC(C)C NNPPMTNAJDCUHE-UHFFFAOYSA-N 0.000 description 4
- IUYHWZFSGMZEOG-UHFFFAOYSA-M magnesium;propane;chloride Chemical compound [Mg+2].[Cl-].C[CH-]C IUYHWZFSGMZEOG-UHFFFAOYSA-M 0.000 description 4
- 230000014759 maintenance of location Effects 0.000 description 4
- 238000006384 oligomerization reaction Methods 0.000 description 4
- 239000002243 precursor Substances 0.000 description 4
- 239000000376 reactant Substances 0.000 description 4
- 239000011550 stock solution Substances 0.000 description 4
- 239000000725 suspension Substances 0.000 description 4
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 4
- 125000006736 (C6-C20) aryl group Chemical group 0.000 description 3
- UPSVYNDQEVZTMB-UHFFFAOYSA-N 2-methyl-1,3,5-trinitrobenzene;1,3,5,7-tetranitro-1,3,5,7-tetrazocane Chemical compound CC1=C([N+]([O-])=O)C=C([N+]([O-])=O)C=C1[N+]([O-])=O.[O-][N+](=O)N1CN([N+]([O-])=O)CN([N+]([O-])=O)CN([N+]([O-])=O)C1 UPSVYNDQEVZTMB-UHFFFAOYSA-N 0.000 description 3
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 3
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- SIAXLNZJVDMSIX-UHFFFAOYSA-N ClP(C(C)(C)C)C1=NC=CC=C1 Chemical compound ClP(C(C)(C)C)C1=NC=CC=C1 SIAXLNZJVDMSIX-UHFFFAOYSA-N 0.000 description 3
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 3
- 241001024304 Mino Species 0.000 description 3
- 239000007832 Na2SO4 Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 3
- BTANRVKWQNVYAZ-UHFFFAOYSA-N butan-2-ol Chemical compound CCC(C)O BTANRVKWQNVYAZ-UHFFFAOYSA-N 0.000 description 3
- 235000013844 butane Nutrition 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 238000004821 distillation Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 239000011630 iodine Substances 0.000 description 3
- 229910052740 iodine Inorganic materials 0.000 description 3
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 3
- 229910000073 phosphorus hydride Inorganic materials 0.000 description 3
- 238000010992 reflux Methods 0.000 description 3
- 229910052938 sodium sulfate Inorganic materials 0.000 description 3
- 150000005846 sugar alcohols Polymers 0.000 description 3
- 239000001117 sulphuric acid Substances 0.000 description 3
- 235000011149 sulphuric acid Nutrition 0.000 description 3
- DNIAPMSPPWPWGF-GSVOUGTGSA-N (R)-(-)-Propylene glycol Chemical compound C[C@@H](O)CO DNIAPMSPPWPWGF-GSVOUGTGSA-N 0.000 description 2
- ARXKVVRQIIOZGF-UHFFFAOYSA-N 1,2,4-butanetriol Chemical compound OCCC(O)CO ARXKVVRQIIOZGF-UHFFFAOYSA-N 0.000 description 2
- KJDRSWPQXHESDQ-UHFFFAOYSA-N 1,4-dichlorobutane Chemical compound ClCCCCCl KJDRSWPQXHESDQ-UHFFFAOYSA-N 0.000 description 2
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- XWJBRBSPAODJER-UHFFFAOYSA-N 1,7-octadiene Chemical compound C=CCCCCC=C XWJBRBSPAODJER-UHFFFAOYSA-N 0.000 description 2
- CTMHWPIWNRWQEG-UHFFFAOYSA-N 1-methylcyclohexene Chemical compound CC1=CCCCC1 CTMHWPIWNRWQEG-UHFFFAOYSA-N 0.000 description 2
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- YIWUKEYIRIRTPP-UHFFFAOYSA-N 2-ethylhexan-1-ol Chemical compound CCCCC(CC)CO YIWUKEYIRIRTPP-UHFFFAOYSA-N 0.000 description 2
- 125000002941 2-furyl group Chemical group O1C([*])=C([H])C([H])=C1[H] 0.000 description 2
- 125000000389 2-pyrrolyl group Chemical group [H]N1C([*])=C([H])C([H])=C1[H] 0.000 description 2
- 125000000175 2-thienyl group Chemical group S1C([*])=C([H])C([H])=C1[H] 0.000 description 2
- OWWRMMIWAOBBFK-UHFFFAOYSA-N 3,4-dimethylhex-1-ene Chemical class CCC(C)C(C)C=C OWWRMMIWAOBBFK-UHFFFAOYSA-N 0.000 description 2
- QDMFTFWKTYXBIW-UHFFFAOYSA-N 3-Methyl-1-heptene Chemical class CCCCC(C)C=C QDMFTFWKTYXBIW-UHFFFAOYSA-N 0.000 description 2
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- LNCDBGQQWZRBIJ-UHFFFAOYSA-N CC(C)(C)P(CCCCP(C1=CC=CC=N1)C(C)(C)C)C1=CC=CC=N1 Chemical compound CC(C)(C)P(CCCCP(C1=CC=CC=N1)C(C)(C)C)C1=CC=CC=N1 LNCDBGQQWZRBIJ-UHFFFAOYSA-N 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 2
- 241001233988 Erysimum cheiri Species 0.000 description 2
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 2
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 2
- GLZPCOQZEFWAFX-UHFFFAOYSA-N Geraniol Chemical compound CC(C)=CCCC(C)=CCO GLZPCOQZEFWAFX-UHFFFAOYSA-N 0.000 description 2
- NHTMVDHEPJAVLT-UHFFFAOYSA-N Isooctane Chemical compound CC(C)CC(C)(C)C NHTMVDHEPJAVLT-UHFFFAOYSA-N 0.000 description 2
- 239000002841 Lewis acid Substances 0.000 description 2
- OYHQOLUKZRVURQ-HZJYTTRNSA-N Linoleic acid Chemical compound CCCCC\C=C/C\C=C/CCCCCCCC(O)=O OYHQOLUKZRVURQ-HZJYTTRNSA-N 0.000 description 2
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Classifications
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- B01J31/02—Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides
- B01J31/12—Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides containing organo-metallic compounds or metal hydrides
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- C07C67/36—Preparation of carboxylic acid esters by reaction with carbon monoxide or formates
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- B01J2231/40—Substitution reactions at carbon centres, e.g. C-C or C-X, i.e. carbon-hetero atom, cross-coupling, C-H activation or ring-opening reactions
- B01J2231/49—Esterification or transesterification
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- B01J2531/00—Additional information regarding catalytic systems classified in B01J31/00
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- B01J2531/0208—Bimetallic complexes, i.e. comprising one or more units of two metals, with metal-metal bonds but no all-metal (M)n rings, e.g. Cr2(OAc)4
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- B01J2531/00—Additional information regarding catalytic systems classified in B01J31/00
- B01J2531/02—Compositional aspects of complexes used, e.g. polynuclearity
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- B01J2531/00—Additional information regarding catalytic systems classified in B01J31/00
- B01J2531/02—Compositional aspects of complexes used, e.g. polynuclearity
- B01J2531/0238—Complexes comprising multidentate ligands, i.e. more than 2 ionic or coordinative bonds from the central metal to the ligand, the latter having at least two donor atoms, e.g. N, O, S, P
- B01J2531/0241—Rigid ligands, e.g. extended sp2-carbon frameworks or geminal di- or trisubstitution
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- B01J2531/80—Complexes comprising metals of Group VIII as the central metal
- B01J2531/84—Metals of the iron group
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Definitions
- the invention relates to butyl-bridged diphosphine compounds, to metal complexes of these compounds and to the use thereof for alkoxycarbonylation.
- alkoxycarbonylation of ethylenically unsaturated compounds is a process of increasing significance.
- An alkoxycarbonylation is understood to mean the reaction of ethylenically unsaturated compounds (olefins) with carbon monoxide and alcohols in the presence of a metal-ligand complex to give the corresponding esters.
- the metal used is palladium.
- the following scheme shows the general reaction equation of an alkoxycarbonylation:
- alkoxycarbonylation reactions particularly the reaction of ethene and methanol to give 3-methylpropionate (ethene methoxycarbonylation) is of significance as an intermediate step for the preparation of methyl methacrylate (S. G. Khokarale, E. J. Garcia-Suárez, J. Xiong, U. V. Mentzel, R. Fehrmann, A. Riisager, Catalysis Communications 2014, 44, 73-75).
- Ethene methoxycarbonylation is conducted in methanol as solvent under mild conditions with a palladium catalyst modified by phosphine ligands.
- bidentate diphosphine compounds are used here as ligands.
- a very good catalytic system was developed by Lucite—now Mitsubishi Rayon—and uses a ligand based on 1,2-bis(di-tert-butylphosphinomethyl)benzene (DTBPMB) (W. Clegg, G. R. Eastham, M. R. J. Elsegood, R. P. Tooze, X. L. Wang, K. Whiston, Chem. Commun. 1999, 1877-1878).
- DTBPMB 1,2-bis(di-tert-butylphosphinomethyl)benzene
- EP 0975574 A1 discloses the carbonylation of 3-methoxy-1-butene to give methyl 3-pentenoate in the presence of, for example, 1,4-bis(diphenylphosphino)butane and 1,4-bis(dicyclohexylphosphino)butane.
- 1,4-Bis(dialkylphosphino)butane compounds are also used in other sectors as ligands for palladium catalysts.
- WO 02/10178 discloses the use of 1,4-bis(diadamantyl-phosphino)butane as a ligand for adding value to haloaromatics and for production of arylolefins, dienes, diaryls, benzoic acid and acrylic acid derivatives, arylalkanes and amines.
- these ligands for alkoxycarbonylation.
- the problem addressed by the present invention is that of providing novel ligands for alkoxycarbonylation, with which good yields of esters can be achieved. More particularly, the ligands according to the invention are to be suitable for the alkoxycarbonylation of long-chain ethylenically unsaturated compounds, for example C 8 olefins, and of mixtures of ethylenically unsaturated compounds.
- butyl-bridged diphosphine compounds substituted by at least one heteroaryl radical on at least one phosphorus atom. These compounds are particularly suitable as bidentate ligands for palladium complexes and lead to elevated yields in the alkoxycarbonylation of ethylenically unsaturated compounds, especially of C 8 olefins.
- diphosphine compounds according to the invention are compounds of formula (I)
- R 1 , R 2 , R 3 , R 4 are each independently selected from —(C 1 -C 12 )-alkyl, —(C 3 -C 12 )-cycloalkyl, —(C 3 -C 12 )-heterocycloalkyl, —(C 6 -C 20 )-aryl, —(C 3 -C 20 )-heteroaryl;
- At least one of the R 1 , R 2 , R 3 , R 4 radicals is a —(C 3 -C 20 )-heteroaryl radical
- R 1 , R 2 , R 3 , R 4 if they are —(C 1 -C 12 )-alkyl, —(C 3 -C 12 )-cycloalkyl, —(C 3 -C 12 )-heterocycloalkyl, —(C 6 -C 20 )-aryl or —(C 3 -C 20 )-heteroaryl,
- —(C 1 -C 12 )-alkyl may each independently be substituted by one or more substituents selected from —(C 1 -C 12 )-alkyl, —(C 3 -C 12 )-cycloalkyl, —(C 3 -C 12 )-heterocycloalkyl, —O—(C 1 -C 12 )-alkyl, —O—(C 1 -C 12 )-alkyl-(C 6 -C 20 )-aryl, —O—(C 3 -C 12 )-cycloalkyl, —S—(C 1 -C 12 )-alkyl, —S—(C 3 -C 12 )-cycloalkyl, —COO—(C 1 -C 12 )-alkyl, —COO—(C 3 -C 12 )-cycloalkyl, —CONH—(C 1 -C 12 )-alkyl, —CON
- (C 1 -C 12 )-alkyl encompasses straight-chain and branched alkyl groups having 1 to 12 carbon atoms. These are preferably (C 1 -C 8 )-alkyl groups, more preferably (C 1 -C 6 )-alkyl, most preferably (C 1 -C 4 )-alkyl.
- Suitable (C 1 -C 12 )-alkyl groups are especially methyl, ethyl, propyl, isopropyl, n-butyl, iso-butyl, sec-butyl, tert-butyl, n-pentyl, 2-pentyl, 2-methylbutyl, 3-methylbutyl, 1,2-dimethylpropyl, 1,1-dimethylpropyl, 2,2-dimethylpropyl, 1-ethylpropyl, n-hexyl, 2-hexyl, 2-methylpentyl, 3-methylpentyl, 4-methylpentyl, 1,1-dimethylbutyl, 1,2-dimethylbutyl, 2,2-dimethylbutyl, 1,3-dimethylbutyl, 2,3-dimethylbutyl, 3,3-dimethylbutyl, 1,1,2-trimethylpropyl, 1,2,2-trimethylpropyl, 1-ethylbutyl, 1-ethyl-2
- the elucidations relating to the expression (C 1 -C 12 )-alkyl also apply particularly to the alkyl groups in —O—(C 1 -C 12 )-alkyl, —S—(C 1 -C 12 )-alkyl, —COO—(C 1 -C 12 )-alkyl, —CONH—(C 1 -C 12 )-alkyl, —CO—(C 1 -C 12 )-alkyl and —N—[(C 1 -C 12 )-alkyl] 2 .
- (C 3 -C 12 )-cycloalkyl encompasses mono-, bi- or tricyclic hydrocarbyl groups having 3 to 12 carbon atoms. Preferably, these groups are (C 5 -C 12 )-cycloalkyl.
- the (C 3 -C 12 )-cycloalkyl groups have preferably 3 to 8, more preferably 5 or 6, ring atoms.
- Suitable (C 3 -C 12 )-cycloalkyl groups are especially cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl, cyclododecyl, cyclopentadecyl, norbomyl, adamantyl.
- the elucidations relating to the expression (C 3 -C 12 )-cycloalkyl also apply particularly to the cycloalkyl groups in —O—(C 3 -C 12 )-cycloalkyl, —S—(C 3 -C 12 )-cycloalkyl, —COO—(C 3 -C 12 )-cycloalkyl, —CONH—(C 3 -C 12 )-cycloalkyl, —CO—(C 3 -C 12 )-cycloalkyl.
- (C 3 -C 12 )-heterocycloalkyl encompasses nonaromatic, saturated or partly unsaturated cycloaliphatic groups having 3 to 12 carbon atoms, where one or more of the ring carbon atoms are replaced by heteroatoms.
- the (C 3 -C 12 )-heterocycloalkyl groups have preferably 3 to 8, more preferably 5 or 6, ring atoms and are optionally substituted by aliphatic side chains.
- the heterocycloalkyl groups as opposed to the cycloalkyl groups, one or more of the ring carbon atoms are replaced by heteroatoms or heteroatom-containing groups.
- heteroatoms or the heteroatom-containing groups are preferably selected from O, S, N, N( ⁇ O), C( ⁇ O), S( ⁇ O).
- a (C 3 -C 12 )-heterocycloalkyl group in the context of this invention is thus also ethylene oxide.
- Suitable (C 3 -C 12 )-heterocycloalkyl groups are especially tetrahydrothiophenyl, tetrahydrofuryl, tetrahydropyranyl and dioxanyl.
- (C 6 -C 20 )-aryl encompasses mono- or polycyclic aromatic hydrocarbyl radicals having 6 to 20 carbon atoms. These are preferably (C 6 -C 14 )-aryl, more preferably (C 6 -C 10 )-aryl.
- Suitable (C 6 -C 20 )-aryl groups are especially phenyl, naphthyl, indenyl, fluorenyl, anthracenyl, phenanthrenyl, naphthacenyl, chrysenyl, pyrenyl, coronenyl.
- Preferred (C 6 -C 20 )-aryl groups are phenyl, naphthyl and anthracenyl.
- (C 3 -C 20 )-heteroaryl encompasses mono- or polycyclic aromatic hydrocarbyl radicals having 3 to 20 carbon atoms, where one or more of the carbon atoms are replaced by heteroatoms. Preferred heteroatoms are N, O and S.
- the (C 3 -C 20 )-heteroaryl groups have 3 to 20, preferably 6 to 14 and more preferably 6 to 10 ring atoms.
- pyridyl in the context of this invention is a C 6 -heteroaryl radical; furyl is a C 5 -heteroaryl radical.
- Suitable (C 3 -C 20 )-heteroaryl groups are especially furyl, thienyl, pyrrolyl, oxazolyl, isoxazolyl, thiazolyl, isothiazolyl, imidazolyl, pyrazolyl, furazanyl, tetrazolyl, pyridyl, pyridazinyl, pyrimidyl, pyrazinyl, benzofuranyl, indolyl, isoindolyl, benzimidazolyl, quinolyl, isoquinolyl.
- halogen especially encompasses fluorine, chlorine, bromine and iodine. Particular preference is given to fluorine and chlorine.
- the R 1 , R 2 , R 3 , R 4 radicals if they are —(C 1 -C 12 )-alkyl, —(C 3 -C 12 )-cycloalkyl, —(C 3 -C 12 )-heterocycloalkyl, —(C 6 -C 20 )-aryl, or —(C 3 -C 20 )-heteroaryl, may each independently be substituted by one or more substituents selected from —(C 1 -C 12 )-alkyl, —(C 3 -C 12 )-cycloalkyl, —(C 3 -C 12 )-heterocycloalkyl, —O—(C 1 -C 12 )-alkyl, —O—(C 1 -C 12 )-alkyl-(C 6 -C 20 )-aryl, —O—(C 3 -C 12 )-cycloalkyl,
- the R 1 , R 2 , R 3 , R 4 radicals if they are —(C 1 -C 12 )-alkyl, —(C 3 -C 12 )-cycloalkyl, —(C 3 -C 12 )-heterocycloalkyl, —(C 6 -C 20 )-aryl, or —(C 3 -C 20 )-heteroaryl, may each independently be substituted by one or more substituents selected from —(C 1 -C 12 )-alkyl, —(C 3 -C 12 )-cycloalkyl, —O—(C 1 -C 12 )-alkyl, —O—(C 1 -C 12 )-alkyl-(C 6 -C 20 )-aryl, —O—(C 3 -C 12 )-cycloalkyl, —(C 6 -C 20 )-aryl, —(C 6 -C 20 )
- the R 1 , R 2 , R 3 , R 4 radicals if they are —(C 1 -C 12 )-alkyl, —(C 3 -C 12 )-cycloalkyl, —(C 3 -C 12 )-heterocycloalkyl, —(C 6 -C 20 )-aryl, or —(C 3 -C 20 )-heteroaryl, may each independently be substituted by one or more substituents selected from —(C 1 -C 12 )-alkyl, —O—(C 1 -C 12 )-alkyl-(C 6 -C 20 )-aryl, —(C 3 -C 20 )-heteroaryl, —(C 3 -C 20 )-heteroaryl-(C 1 -C 12 )-alkyl, —(C 3 -C 20 )-heteroaryl-O—(C 1 -C 12 )-alky
- the R 1 , R 2 , R 3 , R 4 radicals if they are —(C 1 -C 12 )-alkyl, —(C 3 -C 12 )-cycloalkyl, —(C 3 -C 12 )-heterocycloalkyl, —(C 6 -C 20 )-aryl, or —(C 3 -C 20 )-heteroaryl, may each independently be substituted by one or more substituents selected from —(C 1 -C 12 )-alkyl and —(C 3 -C 20 )-heteroaryl.
- the R 1 , R 2 , R 3 , R 4 radicals are unsubstituted if they are —(C 1 -C 12 )-alkyl, —(C 3 -C 12 )-cycloalkyl, or —(C 3 -C 12 )-heterocycloalkyl, and may be substituted as described if they are —(C 6 -C 20 )-aryl, or —(C 3 -C 20 )-heteroaryl.
- the R 1 , R 2 , R 3 , R 4 radicals are unsubstituted if they are —(C 1 -C 12 )-alkyl, —(C 3 -C 12 )-cycloalkyl, —(C 3 -C 12 )-heterocycloalkyl, —(C 6 -C 20 )-aryl, or —(C 3 -C 20 )-heteroaryl.
- R 1 , R 2 , R 3 , R 4 are each independently selected from —(C 1 -C 12 )-alkyl, —(C 6 -C 20 )-aryl, —(C 3 -C 20 )-heteroaryl;
- R 1 , R 2 , R 3 , R 4 radicals is a —(C 3 -C 20 )-heteroaryl radical
- R 1 , R 2 , R 3 , R 4 if they are —(C 1 -C 12 )-alkyl, —(C 6 -C 20 )-aryl or —(C 3 -C 20 )-heteroaryl, may each independently be substituted by one or more of the above-described substituents.
- R 1 , R 2 , R 3 , R 4 are each independently selected from —(C 1 -C 12 )-alkyl and —(C 3 -C 20 )-heteroaryl;
- R 1 , R 2 , R 3 , R 4 radicals is a —(C 3 -C 20 )-heteroaryl radical
- R 1 , R 2 , R 3 , R 4 may each independently be substituted by one or more of the above-described substituents.
- At least two of the R 1 , R 2 , R 3 , R 4 radicals are a —(C 3 -C 20 )-heteroaryl radical.
- R 1 and R 3 radicals are each a —(C 3 -C 20 )-heteroaryl radical and may each independently be substituted by one or more of the substituents described above.
- R 2 and R 4 are independently selected from —(C 1 -C 12 )-alkyl, —(C 3 -C 12 )-cycloalkyl, —(C 3 -C 12 )-heterocycloalkyl, —(C 6 -C 20 )-aryl, more preferably from —(C 1 -C 12 )-alkyl, —(C 3 -C 12 )-cycloalkyl, —(C 6 -C 20 )-aryl, most preferably from —(C 1 -C 12 )-alkyl.
- R 2 and R 4 may independently be substituted by one or more of the above-described substituents.
- the R 1 , R 2 , R 3 and R 4 radicals are a —(C 6 -C 20 )-heteroaryl radical and may each independently be substituted by one or more of the substituents described above.
- the R 1 , R 2 , R 3 and R 4 radicals are each independently selected from heteroaryl radicals having five to ten ring atoms, preferably five or six ring atoms.
- the R 1 , R 2 , R 3 and R 4 radicals if they are a heteroaryl radical, are a heteroaryl radical having five ring atoms.
- the R 1 , R 2 , R 3 and R 4 radicals are each independently selected from heteroaryl radicals having six to ten ring atoms.
- the R 1 , R 2 , R 3 and R 4 radicals if they are a heteroaryl radical, are a heteroaryl radical having six ring atoms.
- the R 1 , R 2 , R 3 and R 4 radicals are selected from furyl, thienyl, pyrrolyl, oxazolyl, isoxazolyl, thiazolyl, isothiazolyl, imidazolyl, pyrazolyl, furazanyl, tetrazolyl, pyridyl, pyridazinyl, pyrimidyl, pyrazinyl, benzofuranyl, indolyl, isoindolyl, benzimidazolyl, quinolyl, isoquinolyl, where the heteroaryl radicals mentioned may be substituted as described above.
- the R 1 , R 2 , R 3 and R 4 radicals are selected from furyl, thienyl, pyrrolyl, imidazolyl, pyridyl, pyrimidyl, indolyl, where the heteroaryl radicals mentioned may be substituted as described above.
- the R 1 , R 2 , R 3 and R 4 radicals are selected from 2-furyl, 2-thienyl, 2-pyrrolyl, 2-imidazolyl, 2-pyridyl, 2-pyrimidyl, 2-indolyl, where the heteroaryl radicals mentioned may be substituted as described above.
- the R 1 , R 2 , R 3 and R 4 radicals are selected from 2-furyl, 2-thienyl, N-methyl-2-pyrrolyl, N-phenyl-2-pyrrolyl, N-(2-methoxyphenyl)-2-pyrrolyl, 2-pyrrolyl, N-methyl-2-imidazolyl, 2-imidazolyl, 2-pyridyl, 2-pyrimidyl, N-phenyl-2-indolyl, 2-indolyl, where the heteroaryl radicals mentioned have no further substitution.
- the R 1 , R 2 , R 3 and R 4 radicals are pyridyl, especially 2-pyridyl.
- R 1 and R 3 are a pyridyl radical, preferably 2-pyridyl, and R 2 and R 4 are —(C 1 -C 12 )-alkyl, where R 1 , R 2 , R 3 and R 4 may each be substituted as described above.
- diphosphine compounds according to the invention are a compound of formula (1):
- the invention further relates to complexes comprising Pd and a diphosphine compound according to the invention.
- the diphosphine compound according to the invention serves as a bidentate ligand for the metal atom.
- the complexes serve, for example, as catalysts for alkoxycarbonylation. With the complexes according to the invention, it is possible to achieve high yields in the alkoxycarbonylation of a multitude of different ethylenically unsaturated compounds.
- the complexes according to the invention may also comprise further ligands which coordinate to the metal atom.
- ligands which coordinate to the metal atom.
- These are, for example, ethylenically unsaturated compounds or anions.
- additional ligands are, for example, styrene, acetate anions, maleimides (e.g. N-methylmaleimide), 1,4-naphthoquinone, trifluoroacetate anions or chloride anions.
- the invention further relates to the use of a diphosphine compound according to the invention for catalysis of an alkoxycarbonylation reaction.
- the compound according to the invention can especially be used as a metal complex according to the invention.
- the invention also relates to a process comprising the process steps of:
- process steps a), b), c) and d) can be effected in any desired sequence.
- the addition of CO is effected after the co-reactants have been initially charged in steps a) to c).
- Steps d) and e) can be effected simultaneously or successively.
- CO can also be fed in in two or more steps, in such a way that, for example, a portion of the CO is first fed in, then the mixture is heated, and then a further portion of CO is fed in.
- the ethylenically unsaturated compounds used as reactant in the process according to the invention contain one or more carbon-carbon double bonds. These compounds are also referred to hereinafter as olefins for simplification.
- the double bonds may be terminal or internal.
- the ethylenically unsaturated compound comprises 4 to 30 carbon atoms, preferably 6 to 22 carbon atoms, more preferably 8 to 12 carbon atoms. In a particularly preferred embodiment, the ethylenically unsaturated compound comprises 8 carbon atoms.
- the ethylenically unsaturated compounds may, in addition to the one or more double bonds, contain further functional groups.
- the ethylenically unsaturated compound comprises one or more functional groups selected from carboxyl, thiocarboxyl, sulpho, sulphinyl, carboxylic anhydride, imide, carboxylic ester, sulphonic ester, carbamoyl, sulphamoyl, cyano, carbonyl, carbonothioyl, hydroxyl, sulphhydryl, amino, ether, thioether, aryl, heteroaryl or silyl groups and/or halogen substituents.
- the ethylenically unsaturated compound preferably comprises a total of 2 to 30 carbon atoms, preferably 2 to 22 carbon atoms, more preferably 2 to 12 carbon atoms.
- the ethylenically unsaturated compound does not comprise any further functional groups apart from carbon-carbon double bonds.
- the ethylenically unsaturated compound is an unfunctionalized alkene having at least one double bond and 2 to 30 carbon atoms, preferably 6 to 22 carbon atoms, further preferably 8 to 12 carbon atoms, and most preferably 8 carbon atoms.
- Suitable ethylenically unsaturated compounds are, for example:
- the ethylenically unsaturated compound is selected from propene, 1-butene, cis- and/or trans-2-butene, or mixtures thereof.
- the ethylenically unsaturated compound is selected from 1-pentene, cis- and/or trans-2-pentene, 2-methyl-1-butene, 2-methyl-2-butene, 3-methyl-1-butene, or mixtures thereof.
- the ethylenically unsaturated compound is selected from ethene, propene, 1-butene, cis- and/or trans-2-butene, isobutene, 1,3-butadiene, 1-pentene, cis- and/or trans-2-pentene, 2-methyl-1-butene, 3-methyl-1-butene, 2-methyl-2-butene, hexene, tetramethylethylene, heptene, n-octene, 1-octene, 2-octene, or mixtures thereof.
- a mixture of ethylenically unsaturated compounds is used.
- a mixture in the context of this invention refers to a composition comprising at least two different ethylenically unsaturated compounds, where the proportion of each individual ethylenically unsaturated compound is preferably at least 5% by weight, based on the total weight of the mixture.
- Suitable mixtures of ethylenically unsaturated compounds are those called raffinates I to III.
- Raffinate I comprises 40% to 50% isobutene, 20% to 30% 1-butene, 10% to 20% cis- and trans-2-butene, up to 1% 1,3-butadiene and 10% to 20% n-butane and isobutane.
- Raffinate II is a portion of the C 4 fraction which arises in naphtha cracking and consists essentially of the isomeric n-butenes, isobutane and n-butane after removal of isobutene from raffinate I.
- Raffinate III is a portion of the C 4 fraction which arises in naphtha cracking and consists essentially of the isomeric n-butenes and n-butane.
- di-n-butene also referred to as dibutene, DNB or DnB.
- Di-n-butene is an isomer mixture of C8 olefins which arises from the dimerization of mixtures of 1-butene, cis-2-butene and trans-2-butene.
- raffinate II or raffinate III streams are generally subjected to a catalytic oligomerization, wherein the butanes present (n/iso) emerge unchanged and the olefins present are converted fully or partly.
- higher oligomers tributene C12, tetrabutene C16 generally also form, which are removed by distillation after the reaction. These can likewise be used as reactants.
- a mixture comprising isobutene, 1-butene, cis- and trans-2-butene is used.
- the mixture comprises 1-butene, cis- and trans-2-butene.
- the alkoxycarbonylation according to the invention is catalysed by the Pd complex according to the invention.
- the Pd complex may either be added in process step b) as a preformed complex comprising Pd and the phosphine ligands according to the invention or be formed in situ from a compound comprising Pd and the free phosphine ligand.
- the compound comprising Pd is also referred to as catalyst precursor.
- the ligand can be added in excess, such that the unbound ligand is also present in the reaction mixture.
- the compound comprising Pd is selected from palladium chloride (PdCl 2 ), palladium(II) acetylacetonate [Pd(acac) 2 ], palladium(II) acetate [Pd(OAc) 2 ], dichloro(1,5-cyclooctadiene)palladium(II) [Pd(cod) 2 Cl 2 ], bis(dibenzylideneacetone)palladium [Pd(dba) 2 ], bis(acetonitrile)dichloropalladium(ll) [Pd(CH 3 CN) 2 Cl 2 ], palladium(cinnamyl) dichloride [Pd(cinnamyl)Cl 2 ].
- the compound comprising Pd is PdCl 2 , Pd(acac) 2 or Pd(OAc) 2 .
- PdCl 2 is particularly suitable.
- the alcohol in process step c) may be branched or linear, cyclic, alicyclic, partly cyclic or aliphatic, and is especially a C 1 - to C 30 -alkanol. It is possible to use monoalcohols or polyalcohols.
- the alcohol in process step c) comprises preferably 1 to 30 carbon atoms, more preferably 1 to 22 carbon atoms, especially preferably 1 to 12 carbon atoms. It may be a monoalcohol or a polyalcohol.
- the alcohol may, in addition to the one or more hydroxyl groups, contain further functional groups.
- the alcohol may additionally comprise one or more functional groups selected from carboxyl, thiocarboxyl, sulpho, sulphinyl, carboxylic anhydride, imide, carboxylic ester, sulphonic ester, carbamoyl, sulphamoyl, cyano, carbonyl, carbonothioyl, sulphhydryl, amino, ether, thioether, aryl, heteroaryl or silyl groups and/or halogen substituents.
- the alcohol does not comprise any further functional groups except for hydroxyl groups.
- the alcohol may contain unsaturated and aromatic groups. However, it is preferably an aliphatic alcohol.
- An aliphatic alcohol in the context of this invention refers to an alcohol which does not comprise any aromatic groups, i.e., for example, an alkanol, alkenol or alkynol. Unsaturated nonaromatic alcohols are thus also permitted.
- the alcohol is an alkanol having one or more hydroxyl groups and 1 to 30 carbon atoms, preferably 1 to 22 carbon atoms, more preferably 1 to 12 carbon atoms, most preferably 1 to 6 carbon atoms.
- the alcohol in process step c) is selected from the group of the monoalcohols.
- the alcohol in process step c) is selected from: methanol, ethanol, 1-propanol, isopropanol, isobutanol, tert-butanol, 1-butanol, 2-butanol, 1-pentanol, 2-pentanol, 3-pentanol, 1-hexanol, cyclohexanol, phenol, 2-ethylhexanol, isononanol, 2-propylheptanol.
- the alcohol in process step c) is selected from methanol, ethanol, 1-propanol, 1-butanol, 1-pentanol, 1-hexanol, 2-propanol, tert-butanol, 3-pentanol, cyclohexanol, phenol, and mixtures thereof.
- the alcohol in process step c) is selected from the group of the polyalcohols.
- the alcohol in process step c) is selected from: diols, triols, tetraols.
- the alcohol in process step c) is selected from: cyclohexane-1,2-diol, ethane-1,2-diol, propane-1,3-diol, glycerol, butane-1,2,4-triol, 2-hydroxymethylpropane-1,3-diol, 1,2,6-trihydroxyhexane, pentaerythritol, 1,1,1-tri(hydroxymethyl)ethane, catechol, resorcinol and hydroxyhydroquinone.
- the alcohol in process step c) is selected from: sucrose, fructose, mannose, sorbose, galactose and glucose.
- the alcohol in process step c) is selected from methanol, ethanol, 1-propanol, 1-butanol, 1-pentanol, 1-hexanol.
- the alcohol in process step c) is selected from: methanol, ethanol.
- the alcohol in process step c) is methanol.
- the alcohol in process step c) is used in excess.
- the alcohol in process step c) is used simultaneously as solvent.
- a further solvent is used, selected from: toluene, xylene, tetrahydrofuran (THF) and methylene chloride (CH 2 Cl 2 ).
- CO is fed in in step d) preferably at a partial CO pressure between 0.1 and 10 MPa (1 to 100 bar), preferably between 1 and 8 MPa (10 to 80 bar), more preferably between 2 and 4 MPa (20 to 40 bar).
- the reaction mixture is heated in step e) of the process according to the invention preferably to a temperature between 10° C. and 180° C., preferably between 20 and 160° C., more preferably between 40 and 120° C., in order to convert the ethylenically unsaturated compound to an ester.
- the molar ratio of the ethylenically unsaturated compound initially charged in step a) to the alcohol added in step c) is preferably between 1:1 and 1:20, more preferably 1:2 to 1:10, more preferably 1:3 to 1:4.
- the mass ratio of Pd to the ethylenically unsaturated compound initially charged in step a) is preferably between 0.001% and 0.5% by weight, preferably between 0.01% and 0.1% by weight, more preferably between 0.01% and 0.05% by weight.
- the molar ratio of the diphosphine compound according to the invention to Pd is preferably between 0.1:1 and 400:1, preferably between 0.5:1 and 400:1, more preferably between 1:1 and 100:1, most preferably between 2:1 and 50:1.
- the process is conducted with addition of an acid.
- the process therefore additionally comprises step c′): adding an acid to the reaction mixture.
- This may preferably be a Br ⁇ nsted or Lewis acid.
- Suitable Br ⁇ nsted acids preferably have an acid strength of pK a ⁇ 5, preferably an acid strength of pK a ⁇ 3.
- the reported acid strength pK a is based on the pK a determined under standard conditions (25° C., 1.01325 bar).
- the acid strength pK a in the context of this invention relates to the pK a of the first protolysis step.
- the acid is not a carboxylic acid.
- Suitable Br ⁇ nsted acids are, for example, perchloric acid, sulphuric acid, phosphoric acid, methylphosphonic acid and sulphonic acids.
- the acid is sulphuric acid or a sulphonic acid.
- Suitable sulphonic acids are, for example, methanesulphonic acid, trifluoromethanesulphonic acid, tert-butanesulphonic acid, p-toluenesulphonic acid (PTSA), 2-hydroxypropane-2-sulphonic acid, 2,4,6-trimethylbenzenesulphonic acid and dodecylsulphonic acid.
- Particularly preferred acids are sulphuric acid, methanesulphonic acid, trifluoromethanesulphonic acid and p-toluenesulphonic acid.
- a Lewis acid used may, for example, be aluminium triflate.
- the amount of acid added in step c′) is 0.3 to 40 mol %, preferably 0.4 to 15 mol %, more preferably 0.5 to 5 mol %, most preferably 0.6 to 3 mol %, based on the molar amount of the ethylenically unsaturated compound used in step a).
- the recording of nuclear resonance spectra was effected on Bruker Avance 300 or Bruker Avance 400, gas chromatography analysis on Agilent GC 7890A, elemental analysis on Leco TruSpec CHNS and Varian ICP-OES 715, and ESI-TOF mass spectrometry on Thermo Electron Finnigan MAT 95-XP and Agilent 6890 N/5973 instruments.
- the Grignard for the synthesis of chloro-2-pyridyl-t-butylphosphine is prepared by the “Knochel method” with isopropylmagnesium chloride (Angew. Chem. 2004, 43, 2222-2226).
- the workup is effected according to the method of Budzelaar (Organometallics 1990, 9, 1222-1227).
- the aqueous solution is extracted with a pipette of ether and the organic phase is dried over Na 2 SO 4 .
- a GC of the ethereal solution is recorded.
- a large amount of pyridine has formed compared to 2-bromopyridine, conversions are high. At ⁇ 10° C., there has been little conversion. After warming up to room temperature and stirring for 1-2 hours, the reaction solution turns brown-yellow. A GC test shows complete conversion. Now the Grignard solution can be slowly added dropwise with a syringe pump to a solution of 1.748 g (11 mmol) of dichloro-tert-butylphosphine in 10 ml of THF which has been cooled to ⁇ 15° C. beforehand.
- dichloro-tert-butylphosphine solution is cooled. At room temperature, considerable amounts of dipyridyl-tert-butylphosphine would be obtained. A clear yellow solution is initially formed, which then turns cloudy. The mixture is left to warm up to room temperature and to stir overnight. According to GC-MS, a large amount of product has formed. The solvent is removed under high vacuum and a whitish solid which is brown in places is obtained. The solid is suspended with 20 ml of heptane and the solid is comminuted in an ultrasound bath. After allowing the white solid to settle out, the solution is decanted. The operation is repeated twice with 10-20 ml each time of heptane.
- the cloudy THF solution is decanted and the activated magnesium powder is washed twice with 1-2 ml of THF. Then another 20 ml of fresh THF are added. At room temperature, a solution of 755.5 ⁇ l (6.9 mmol) of 1,4-dichlorobutane in 70 ml of THF is slowly added dropwise with a syringe pump. The THF solution is clear and pale yellow. The next day, the solution is dark grey but clear and is filtered through Celite. A sample of the Grignard solution is quenched and examined in GC as follows:
- Grignard compound The content of Grignard compound is determined as follows:
- the borane adduct has good solubility in the warm ethyl acetate.
- the solvent is removed completely on a rotary evaporator and the product which has been absorbed on silica gel is chromatographed with a Combi-Flash apparatus.
- the eluent used is 1:10 (ethyl acetate/heptane). 3.1 g (74%) of diadamantylphosphine borane adduct are obtained.
- Di-n-butene was also referred to as follows: dibutene, DNB or DnB.
- Di-n-butene is an isomer mixture of C8 olefins which arises from the dimerization of mixtures of 1-butene, cis-2-butene and trans-2-butene.
- raffinate II or raffinate III streams are generally subjected to a catalytic oligomerization, wherein the butanes present (n/iso) emerge unchanged and the olefins present are converted fully or partly.
- higher oligomers tributene C12, tetrabutene C16
- tributene C12, tetrabutene C16 generally also form, which have to be removed by distillation after the reaction.
- OCTOL process Another process practised in industry for oligomerization of C4 olefins is called the “OCTOL process”.
- EP1029839A1 is concerned with the fractionation of the C8 olefins formed in the OCTOL process.
- Technical di-n-butene consists generally to an extent of 5% to 30% of n-octenes, 45% to 75% of 3-methylheptenes, and to an extent of 10% to 35% of 3,4-dimethylhexenes.
- Preferred streams contain 10% to 20% n-octenes, 55% to 65% 3-methylheptenes, and 15% to 25% 3,4-dimethylhexenes.
- para-Toluenesulphonic acid was abbreviated as follows: pTSA, PTSA or p-TSA.
- PTSA in this text always refers to para-toluenesulphonic acid monohydrate.
- a 300 ml Parr reactor is used. Matched to this is an aluminium block of corresponding dimensions which has been manufactured in-house and which is suitable for heating by means of a conventional magnetic stirrer, for example from Heidolph.
- a conventional magnetic stirrer for example from Heidolph.
- a round metal plate of thickness about 1.5 cm was manufactured, containing 6 holes corresponding to the external diameter of the glass vials. Matching these glass vials, they are equipped with small magnetic stirrers.
- These glass vials are provided with screw caps and suitable septa and charged, using a special apparatus manufactured by glass blowers, under argon with the appropriate reactants, solvents and catalysts and additives.
- the autoclave is purged with nitrogen.
- the vials are taken from the autoclave, and a defined amount of a suitable standard is added.
- a GC analysis is effected, the results of which are used to determine yields and selectivities.
- GC analysis of di-n-butene for the GC analysis, an Agilent 7890A gas chromatograph having a 30 m HP5 column is used. Temperature profile: 35° C., 10 min; 10° C./min to 200° C.; the injection volume is 1 ⁇ l with a split of 50:1.
- the esters formed from di-n-butene are referred to hereinafter as MINO (methyl isononanoate).
- TON turnover number, defined as moles of product per mole of catalyst metal, is a measure of the productivity of the catalytic complex.
- TOF turnover frequency, defined as TON per unit time for the attainment of a particular conversion, e.g. 50%.
- the TOF is a measure of the activity of the catalytic system.
- n selectivities reported hereinafter relate to the proportion of terminal methoxycarbonylation based on the overall yield of methoxycarbonylation products.
- the n/iso ratio indicates the ratio of olefins converted terminally to esters to olefins converted internally to esters.
- Ligand 2 (comparative example): A 25 ml Schlenk vessel was charged with a stock solution of [Pd(acac) 2 ] (1.95 mg, 6.4 ⁇ mol), p-toluenesulphonic acid (PTSA) (18.24 mg, 95.89 ⁇ mol) and MeOH (10 ml). A 4 ml vial was charged with 2 (2.11 mg, 0.16 mol % based on the molar amount of di-n-butene), and a magnetic stirrer bar was added. Thereafter, 1.25 ml of the clear yellow stock solution and di-n-butene (315 ⁇ l, 2 mmol) were added with a syringe.
- PTSA p-toluenesulphonic acid
- the molar proportions based on the molar amount of di-n-butene are thus 0.04 mol % for Pd(acac) 2 and 0.6 mol % for PTSA.
- the vial was placed into a sample holder which was in turn inserted into a 300 ml Parr autoclave under an argon atmosphere. After the autoclave had been purged three times with nitrogen, the CO pressure was adjusted to 40 bar. The reaction proceeded at 120° C. for 20 hours. On conclusion of the reaction, the autoclave was cooled down to room temperature and cautiously decompressed. Isooctane was added as internal GC standard. Yield and regioselectivity were determined by means of GC. No MINO formation was observed.
- Ligand 1 A 25 ml Schlenk vessel was charged with a stock solution of [Pd(acac) 2 ] (1.95 mg, 6.4 ⁇ mol), p-toluenesulphonic acid (PTSA) (18.24 mg, 95.89 ⁇ mol) and MeOH (10 ml). A 4 ml vial was charged with 1 (1.24 mg, 0.16 ⁇ mol % based on the molar amount of di-n-butene), and a magnetic stirrer bar was added. Thereafter, 1.25 ml of the clear yellow stock solution and di-n-butene (315 ⁇ l, 2 mmol) were added with a syringe.
- PTSA p-toluenesulphonic acid
- the molar proportions based on the molar amount of di-n-butene are thus 0.04 mol % for Pd(acac) 2 and 0.6 mol % for PTSA.
- the vial was placed into a sample holder which was in turn inserted into a 300 ml Parr autoclave under an argon atmosphere. After the autoclave had been purged three times with nitrogen, the CO pressure was adjusted to 40 bar. The reaction proceeded at 120° C. for 20 hours. On conclusion of the reaction, the autoclave was cooled down to room temperature and cautiously decompressed. Isooctane was added as internal GC standard. Yield and regioselectivity were determined by means of GC. (MINO yield: 13%, n/iso regioselectivity: 59/41).
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Abstract
- where
- R1, R2, R3, R4 are each independently selected from —(C1-C12)-alkyl, —(C3-C12)-cycloalkyl, —(C3-C12)-heterocycloalkyl, —(C6-C20)-aryl, —(C3-C20)-heteroaryl;
- at least one of the R1, R2, R3, R4 radicals is a —(C3-C20)-heteroaryl radical;
- and
- R1, R2, R3, R4, if they are —(C1-C12)-alkyl, —(C3-C12)-cycloalkyl, —(C3-C12)-heterocycloalkyl, —(C6-C20)-aryl or —(C3-C20)-heteroaryl,
- may each independently be substituted by one or more substituents selected from —(C1-C12)-alkyl, —(C3-C12)-cycloalkyl, —(C3-C12)-heterocycloalkyl, —O—(C1-C12)-alkyl, —O—(C1-C12)-alkyl-(C6-C20)-aryl, —O—(C3-C12)-cycloalkyl, —S—(C1-C12)-alkyl, —S—(C3-C12)-cycloalkyl, —COO—(C1-C12)-alkyl, —COO—(C3-C12)-cycloalkyl, —CONH—(C1-C12)-alkyl, —CONH—(C3-C12)-cycloalkyl, —CO—(C1-C12)-alkyl, —CO—(C3-C12)-cycloalkyl, —N—[(C1-C12)-alkyl]2, —(C6-C20)-aryl, —(C6-C20)-aryl-(C1-C12)-alkyl, —(C6-C20)-aryl-O—(C1-C12)-alkyl, —(C3-C20)-heteroaryl, —(C3-C20)-heteroaryl-(C1-C12)-alkyl, —(C3-C20)-heteroaryl-O-(C1-C12)-alkyl, —COOH, —OH, —SO3H, —NH2, halogen;
- and to the use thereof as ligands in alkoxycarbonylation.
Description
- The invention relates to butyl-bridged diphosphine compounds, to metal complexes of these compounds and to the use thereof for alkoxycarbonylation.
- The alkoxycarbonylation of ethylenically unsaturated compounds is a process of increasing significance. An alkoxycarbonylation is understood to mean the reaction of ethylenically unsaturated compounds (olefins) with carbon monoxide and alcohols in the presence of a metal-ligand complex to give the corresponding esters. Typically, the metal used is palladium. The following scheme shows the general reaction equation of an alkoxycarbonylation:
- Among the alkoxycarbonylation reactions, particularly the reaction of ethene and methanol to give 3-methylpropionate (ethene methoxycarbonylation) is of significance as an intermediate step for the preparation of methyl methacrylate (S. G. Khokarale, E. J. Garcia-Suárez, J. Xiong, U. V. Mentzel, R. Fehrmann, A. Riisager, Catalysis Communications 2014, 44, 73-75). Ethene methoxycarbonylation is conducted in methanol as solvent under mild conditions with a palladium catalyst modified by phosphine ligands.
- Typically, bidentate diphosphine compounds are used here as ligands. A very good catalytic system was developed by Lucite—now Mitsubishi Rayon—and uses a ligand based on 1,2-bis(di-tert-butylphosphinomethyl)benzene (DTBPMB) (W. Clegg, G. R. Eastham, M. R. J. Elsegood, R. P. Tooze, X. L. Wang, K. Whiston, Chem. Commun. 1999, 1877-1878).
- EP 0975574 A1 discloses the carbonylation of 3-methoxy-1-butene to give methyl 3-pentenoate in the presence of, for example, 1,4-bis(diphenylphosphino)butane and 1,4-bis(dicyclohexylphosphino)butane. The carbonylation of long-chain ethylenically unsaturated compounds, such as octene for example, is not examined.
- 1,4-Bis(dialkylphosphino)butane compounds are also used in other sectors as ligands for palladium catalysts. For example, WO 02/10178 discloses the use of 1,4-bis(diadamantyl-phosphino)butane as a ligand for adding value to haloaromatics and for production of arylolefins, dienes, diaryls, benzoic acid and acrylic acid derivatives, arylalkanes and amines. However, there is no description of the use of these ligands for alkoxycarbonylation.
- The problem addressed by the present invention is that of providing novel ligands for alkoxycarbonylation, with which good yields of esters can be achieved. More particularly, the ligands according to the invention are to be suitable for the alkoxycarbonylation of long-chain ethylenically unsaturated compounds, for example C8 olefins, and of mixtures of ethylenically unsaturated compounds.
- This problem is solved by butyl-bridged diphosphine compounds substituted by at least one heteroaryl radical on at least one phosphorus atom. These compounds are particularly suitable as bidentate ligands for palladium complexes and lead to elevated yields in the alkoxycarbonylation of ethylenically unsaturated compounds, especially of C8 olefins.
- The diphosphine compounds according to the invention are compounds of formula (I)
- where
- R1, R2, R3, R4 are each independently selected from —(C1-C12)-alkyl, —(C3-C12)-cycloalkyl, —(C3-C12)-heterocycloalkyl, —(C6-C20)-aryl, —(C3-C20)-heteroaryl;
- at least one of the R1, R2, R3, R4 radicals is a —(C3-C20)-heteroaryl radical;
- and
- R1, R2, R3, R4, if they are —(C1-C12)-alkyl, —(C3-C12)-cycloalkyl, —(C3-C12)-heterocycloalkyl, —(C6-C20)-aryl or —(C3-C20)-heteroaryl,
- may each independently be substituted by one or more substituents selected from —(C1-C12)-alkyl, —(C3-C12)-cycloalkyl, —(C3-C12)-heterocycloalkyl, —O—(C1-C12)-alkyl, —O—(C1-C12)-alkyl-(C6-C20)-aryl, —O—(C3-C12)-cycloalkyl, —S—(C1-C12)-alkyl, —S—(C3-C12)-cycloalkyl, —COO—(C1-C12)-alkyl, —COO—(C3-C12)-cycloalkyl, —CONH—(C1-C12)-alkyl, —CONH—(C3-C12)-cycloalkyl, —CO—(C1-C12)-alkyl, —CO—(C3-C12)-cycloalkyl, —N—[(C1-C12)-alkyl]2, —(C6-C20)-aryl, —(C6-C20)-aryl-(C1-C12)-alkyl, —(C6-C20)-aryl-O—(C1-C12)-alkyl, —(C3-C20)-heteroaryl, —(C3-C20)-heteroaryl-(C1-C12)-alkyl, —(C3-C20)-heteroaryl-O—(C1-C12)-alkyl, —COOH, —OH, —SO3H, —NH2, halogen.
- The expression (C1-C12)-alkyl encompasses straight-chain and branched alkyl groups having 1 to 12 carbon atoms. These are preferably (C1-C8)-alkyl groups, more preferably (C1-C6)-alkyl, most preferably (C1-C4)-alkyl.
- Suitable (C1-C12)-alkyl groups are especially methyl, ethyl, propyl, isopropyl, n-butyl, iso-butyl, sec-butyl, tert-butyl, n-pentyl, 2-pentyl, 2-methylbutyl, 3-methylbutyl, 1,2-dimethylpropyl, 1,1-dimethylpropyl, 2,2-dimethylpropyl, 1-ethylpropyl, n-hexyl, 2-hexyl, 2-methylpentyl, 3-methylpentyl, 4-methylpentyl, 1,1-dimethylbutyl, 1,2-dimethylbutyl, 2,2-dimethylbutyl, 1,3-dimethylbutyl, 2,3-dimethylbutyl, 3,3-dimethylbutyl, 1,1,2-trimethylpropyl, 1,2,2-trimethylpropyl, 1-ethylbutyl, 1-ethyl-2-methylpropyl, n-heptyl, 2-heptyl, 3-heptyl, 2-ethylpentyl, 1-propylbutyl, n-octyl, 2-ethylhexyl, 2-propylheptyl, nonyl, decyl.
- The elucidations relating to the expression (C1-C12)-alkyl also apply particularly to the alkyl groups in —O—(C1-C12)-alkyl, —S—(C1-C12)-alkyl, —COO—(C1-C12)-alkyl, —CONH—(C1-C12)-alkyl, —CO—(C1-C12)-alkyl and —N—[(C1-C12)-alkyl]2.
- The expression (C3-C12)-cycloalkyl encompasses mono-, bi- or tricyclic hydrocarbyl groups having 3 to 12 carbon atoms. Preferably, these groups are (C5-C12)-cycloalkyl.
- The (C3-C12)-cycloalkyl groups have preferably 3 to 8, more preferably 5 or 6, ring atoms.
- Suitable (C3-C12)-cycloalkyl groups are especially cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl, cyclododecyl, cyclopentadecyl, norbomyl, adamantyl.
- The elucidations relating to the expression (C3-C12)-cycloalkyl also apply particularly to the cycloalkyl groups in —O—(C3-C12)-cycloalkyl, —S—(C3-C12)-cycloalkyl, —COO—(C3-C12)-cycloalkyl, —CONH—(C3-C12)-cycloalkyl, —CO—(C3-C12)-cycloalkyl.
- The expression (C3-C12)-heterocycloalkyl encompasses nonaromatic, saturated or partly unsaturated cycloaliphatic groups having 3 to 12 carbon atoms, where one or more of the ring carbon atoms are replaced by heteroatoms. The (C3-C12)-heterocycloalkyl groups have preferably 3 to 8, more preferably 5 or 6, ring atoms and are optionally substituted by aliphatic side chains. In the heterocycloalkyl groups, as opposed to the cycloalkyl groups, one or more of the ring carbon atoms are replaced by heteroatoms or heteroatom-containing groups. The heteroatoms or the heteroatom-containing groups are preferably selected from O, S, N, N(═O), C(═O), S(═O). A (C3-C12)-heterocycloalkyl group in the context of this invention is thus also ethylene oxide.
- Suitable (C3-C12)-heterocycloalkyl groups are especially tetrahydrothiophenyl, tetrahydrofuryl, tetrahydropyranyl and dioxanyl.
- The expression (C6-C20)-aryl encompasses mono- or polycyclic aromatic hydrocarbyl radicals having 6 to 20 carbon atoms. These are preferably (C6-C14)-aryl, more preferably (C6-C10)-aryl.
- Suitable (C6-C20)-aryl groups are especially phenyl, naphthyl, indenyl, fluorenyl, anthracenyl, phenanthrenyl, naphthacenyl, chrysenyl, pyrenyl, coronenyl. Preferred (C6-C20)-aryl groups are phenyl, naphthyl and anthracenyl.
- The expression (C3-C20)-heteroaryl encompasses mono- or polycyclic aromatic hydrocarbyl radicals having 3 to 20 carbon atoms, where one or more of the carbon atoms are replaced by heteroatoms. Preferred heteroatoms are N, O and S. The (C3-C20)-heteroaryl groups have 3 to 20, preferably 6 to 14 and more preferably 6 to 10 ring atoms. Thus, for example, pyridyl in the context of this invention is a C6-heteroaryl radical; furyl is a C5-heteroaryl radical.
- Suitable (C3-C20)-heteroaryl groups are especially furyl, thienyl, pyrrolyl, oxazolyl, isoxazolyl, thiazolyl, isothiazolyl, imidazolyl, pyrazolyl, furazanyl, tetrazolyl, pyridyl, pyridazinyl, pyrimidyl, pyrazinyl, benzofuranyl, indolyl, isoindolyl, benzimidazolyl, quinolyl, isoquinolyl.
- The expression halogen especially encompasses fluorine, chlorine, bromine and iodine. Particular preference is given to fluorine and chlorine.
- In one embodiment, the R1, R2, R3, R4 radicals, if they are —(C1-C12)-alkyl, —(C3-C12)-cycloalkyl, —(C3-C12)-heterocycloalkyl, —(C6-C20)-aryl, or —(C3-C20)-heteroaryl, may each independently be substituted by one or more substituents selected from —(C1-C12)-alkyl, —(C3-C12)-cycloalkyl, —(C3-C12)-heterocycloalkyl, —O—(C1-C12)-alkyl, —O—(C1-C12)-alkyl-(C6-C20)-aryl, —O—(C3-C12)-cycloalkyl, —S—(C1-C12)-alkyl, —S—(C3-C12)-cycloalkyl, —(C6-C20)-aryl, —(C6-C20)-aryl-(C1-C12)-alkyl, —(C6-C20)-aryl-O—(C1-C12)-alkyl, —(C3-C20)-heteroaryl, —(C3-C20)-heteroaryl-(C1-C12)-alkyl, —(C3-C20)-heteroaryl-O—(C1-C12)-alkyl, —COOH, —OH, —SO3H, —NH2, halogen.
- In one embodiment, the R1, R2, R3, R4 radicals, if they are —(C1-C12)-alkyl, —(C3-C12)-cycloalkyl, —(C3-C12)-heterocycloalkyl, —(C6-C20)-aryl, or —(C3-C20)-heteroaryl, may each independently be substituted by one or more substituents selected from —(C1-C12)-alkyl, —(C3-C12)-cycloalkyl, —O—(C1-C12)-alkyl, —O—(C1-C12)-alkyl-(C6-C20)-aryl, —O—(C3-C12)-cycloalkyl, —(C6-C20)-aryl, —(C6-C20)-aryl-(C1-C12)-alkyl, —(C6-C20)-aryl-O—(C1-C12)-alkyl, —(C3-C20)-heteroaryl, —(C3-C20)-heteroaryl-(C1-C12)-alkyl, —(C3-C20)-heteroaryl-O—(C1-C12)-alkyl.
- In one embodiment, the R1, R2, R3, R4 radicals, if they are —(C1-C12)-alkyl, —(C3-C12)-cycloalkyl, —(C3-C12)-heterocycloalkyl, —(C6-C20)-aryl, or —(C3-C20)-heteroaryl, may each independently be substituted by one or more substituents selected from —(C1-C12)-alkyl, —O—(C1-C12)-alkyl-(C6-C20)-aryl, —(C3-C20)-heteroaryl, —(C3-C20)-heteroaryl-(C1-C12)-alkyl, —(C3-C20)-heteroaryl-O—(C1-C12)-alkyl.
- In one embodiment, the R1, R2, R3, R4 radicals, if they are —(C1-C12)-alkyl, —(C3-C12)-cycloalkyl, —(C3-C12)-heterocycloalkyl, —(C6-C20)-aryl, or —(C3-C20)-heteroaryl, may each independently be substituted by one or more substituents selected from —(C1-C12)-alkyl and —(C3-C20)-heteroaryl.
- In one embodiment, the R1, R2, R3, R4 radicals are unsubstituted if they are —(C1-C12)-alkyl, —(C3-C12)-cycloalkyl, or —(C3-C12)-heterocycloalkyl, and may be substituted as described if they are —(C6-C20)-aryl, or —(C3-C20)-heteroaryl.
- In one embodiment, the R1, R2, R3, R4 radicals are unsubstituted if they are —(C1-C12)-alkyl, —(C3-C12)-cycloalkyl, —(C3-C12)-heterocycloalkyl, —(C6-C20)-aryl, or —(C3-C20)-heteroaryl.
- In one embodiment, R1, R2, R3, R4 are each independently selected from —(C1-C12)-alkyl, —(C6-C20)-aryl, —(C3-C20)-heteroaryl;
- where at least one of the R1, R2, R3, R4 radicals is a —(C3-C20)-heteroaryl radical;
- and R1, R2, R3, R4, if they are —(C1-C12)-alkyl, —(C6-C20)-aryl or —(C3-C20)-heteroaryl, may each independently be substituted by one or more of the above-described substituents.
- In a preferred embodiment, R1, R2, R3, R4 are each independently selected from —(C1-C12)-alkyl and —(C3-C20)-heteroaryl;
- where at least one of the R1, R2, R3, R4 radicals is a —(C3-C20)-heteroaryl radical;
- and R1, R2, R3, R4 may each independently be substituted by one or more of the above-described substituents.
- In one embodiment, at least two of the R1, R2, R3, R4 radicals are a —(C3-C20)-heteroaryl radical.
- In one embodiment, the R1 and R3 radicals are each a —(C3-C20)-heteroaryl radical and may each independently be substituted by one or more of the substituents described above. Preferably, R2 and R4 are independently selected from —(C1-C12)-alkyl, —(C3-C12)-cycloalkyl, —(C3-C12)-heterocycloalkyl, —(C6-C20)-aryl, more preferably from —(C1-C12)-alkyl, —(C3-C12)-cycloalkyl, —(C6-C20)-aryl, most preferably from —(C1-C12)-alkyl. R2 and R4 may independently be substituted by one or more of the above-described substituents.
- In one embodiment, the R1, R2, R3 and R4 radicals are a —(C6-C20)-heteroaryl radical and may each independently be substituted by one or more of the substituents described above.
- In one embodiment, the R1, R2, R3 and R4 radicals, if they are a heteroaryl radical, are each independently selected from heteroaryl radicals having five to ten ring atoms, preferably five or six ring atoms.
- In one embodiment, the R1, R2, R3 and R4 radicals, if they are a heteroaryl radical, are a heteroaryl radical having five ring atoms.
- In one embodiment, the R1, R2, R3 and R4 radicals, if they are a heteroaryl radical, are each independently selected from heteroaryl radicals having six to ten ring atoms.
- In one embodiment, the R1, R2, R3 and R4 radicals, if they are a heteroaryl radical, are a heteroaryl radical having six ring atoms.
- In one embodiment, the R1, R2, R3 and R4 radicals, if they are a heteroaryl radical, are selected from furyl, thienyl, pyrrolyl, oxazolyl, isoxazolyl, thiazolyl, isothiazolyl, imidazolyl, pyrazolyl, furazanyl, tetrazolyl, pyridyl, pyridazinyl, pyrimidyl, pyrazinyl, benzofuranyl, indolyl, isoindolyl, benzimidazolyl, quinolyl, isoquinolyl, where the heteroaryl radicals mentioned may be substituted as described above.
- In one embodiment, the R1, R2, R3 and R4 radicals, if they are a heteroaryl radical, are selected from furyl, thienyl, pyrrolyl, imidazolyl, pyridyl, pyrimidyl, indolyl, where the heteroaryl radicals mentioned may be substituted as described above.
- In one embodiment, the R1, R2, R3 and R4 radicals, if they are a heteroaryl radical, are selected from 2-furyl, 2-thienyl, 2-pyrrolyl, 2-imidazolyl, 2-pyridyl, 2-pyrimidyl, 2-indolyl, where the heteroaryl radicals mentioned may be substituted as described above.
- In one embodiment, the R1, R2, R3 and R4 radicals, if they are a heteroaryl radical, are selected from 2-furyl, 2-thienyl, N-methyl-2-pyrrolyl, N-phenyl-2-pyrrolyl, N-(2-methoxyphenyl)-2-pyrrolyl, 2-pyrrolyl, N-methyl-2-imidazolyl, 2-imidazolyl, 2-pyridyl, 2-pyrimidyl, N-phenyl-2-indolyl, 2-indolyl, where the heteroaryl radicals mentioned have no further substitution.
- More preferably, the R1, R2, R3 and R4 radicals, if they are a heteroaryl radical, are pyridyl, especially 2-pyridyl.
- In one embodiment, R1 and R3 are a pyridyl radical, preferably 2-pyridyl, and R2 and R4 are —(C1-C12)-alkyl, where R1, R2, R3 and R4 may each be substituted as described above.
- In one embodiment, the diphosphine compounds according to the invention are a compound of formula (1):
- The invention further relates to complexes comprising Pd and a diphosphine compound according to the invention. In these complexes, the diphosphine compound according to the invention serves as a bidentate ligand for the metal atom. The complexes serve, for example, as catalysts for alkoxycarbonylation. With the complexes according to the invention, it is possible to achieve high yields in the alkoxycarbonylation of a multitude of different ethylenically unsaturated compounds.
- The complexes according to the invention may also comprise further ligands which coordinate to the metal atom. These are, for example, ethylenically unsaturated compounds or anions. Suitable additional ligands are, for example, styrene, acetate anions, maleimides (e.g. N-methylmaleimide), 1,4-naphthoquinone, trifluoroacetate anions or chloride anions.
- The invention further relates to the use of a diphosphine compound according to the invention for catalysis of an alkoxycarbonylation reaction. The compound according to the invention can especially be used as a metal complex according to the invention.
- The invention also relates to a process comprising the process steps of:
-
- a) initially charging an ethylenically unsaturated compound;
- b) adding a diphosphine compound according to the invention and a compound comprising Pd,
- or adding a complex according to the invention comprising Pd and a diphosphine compound according to the invention;
- c) adding an alcohol;
- d) feeding in CO;
- e) heating the reaction mixture, with conversion of the ethylenically unsaturated compound to an ester.
- In this process, process steps a), b), c) and d) can be effected in any desired sequence. Typically, however, the addition of CO is effected after the co-reactants have been initially charged in steps a) to c). Steps d) and e) can be effected simultaneously or successively. In addition, CO can also be fed in in two or more steps, in such a way that, for example, a portion of the CO is first fed in, then the mixture is heated, and then a further portion of CO is fed in.
- The ethylenically unsaturated compounds used as reactant in the process according to the invention contain one or more carbon-carbon double bonds. These compounds are also referred to hereinafter as olefins for simplification. The double bonds may be terminal or internal.
- Preference is given to ethylenically unsaturated compounds having 2 to 30 carbon atoms, preferably 2 to 22 carbon atoms, more preferably 2 to 12 carbon atoms.
- In one embodiment, the ethylenically unsaturated compound comprises 4 to 30 carbon atoms, preferably 6 to 22 carbon atoms, more preferably 8 to 12 carbon atoms. In a particularly preferred embodiment, the ethylenically unsaturated compound comprises 8 carbon atoms.
- The ethylenically unsaturated compounds may, in addition to the one or more double bonds, contain further functional groups. Preferably, the ethylenically unsaturated compound comprises one or more functional groups selected from carboxyl, thiocarboxyl, sulpho, sulphinyl, carboxylic anhydride, imide, carboxylic ester, sulphonic ester, carbamoyl, sulphamoyl, cyano, carbonyl, carbonothioyl, hydroxyl, sulphhydryl, amino, ether, thioether, aryl, heteroaryl or silyl groups and/or halogen substituents. At the same time, the ethylenically unsaturated compound preferably comprises a total of 2 to 30 carbon atoms, preferably 2 to 22 carbon atoms, more preferably 2 to 12 carbon atoms.
- In one embodiment, the ethylenically unsaturated compound does not comprise any further functional groups apart from carbon-carbon double bonds.
- In a particularly preferred embodiment, the ethylenically unsaturated compound is an unfunctionalized alkene having at least one double bond and 2 to 30 carbon atoms, preferably 6 to 22 carbon atoms, further preferably 8 to 12 carbon atoms, and most preferably 8 carbon atoms.
- Suitable ethylenically unsaturated compounds are, for example:
-
- ethene;
- propene;
- C4 olefins such as 1-butene, cis-2-butene, trans-2-butene, mixture of cis- and trans-2-butene, isobutene, 1,3-butadiene; raffinate I to III, crack-C4
- C5 olefins such as 1-pentene, 2-pentene, 2-methyl-1-butene, 2-methyl-2-butene, 2-methyl-1,3-butadiene (isoprene), 1,3-pentadiene;
- C6 olefins such as tetramethylethylene, 1,3-hexadiene, 1,3-cyclohexadiene;
- C7 olefins such as 1-methylcyclohexene, 2,4-heptadiene, norbornadiene;
- C8 olefins such as 1-octene, 2-octene, cyclooctene, di-n-butene, diisobutene, 1,5-cyclooctadiene, 1,7-octadiene;
- C9 olefins such as tripropene;
- C10 olefins such as dicyclopentadiene;
- undecenes;
- dodecenes;
- internal C14 olefins;
- internal C15 to C18 olefins;
- linear or branched, cyclic, acyclic or partly cyclic, internal C15 to C30 olefins;
- triisobutene, tri-n-butene;
- terpenes such as limonene, geraniol, farnesol, pinene, myrcene, carvone, 3-carene;
- polyunsaturated compounds having 18 carbon atoms, such as linoleic acid or linolenic acid;
- esters of unsaturated carboxylic acids, such as vinyl esters of acetic or propionic acid, alkyl esters of unsaturated carboxylic acids, methyl or ethyl esters of acrylic acid and methacrylic acid, oleic esters, such as methyl or ethyl oleate, esters of linoleic or linolenic acid;
- vinyl compounds such as vinyl acetate, vinylcyclohexene, styrene, alpha-methylstyrene, 2-isopropenylnaphthalene;
- 2-methyl-2-pentenal, methyl 3-pentenoate, methacrylic anhydride.
- In one variant of the process, the ethylenically unsaturated compound is selected from propene, 1-butene, cis- and/or trans-2-butene, or mixtures thereof.
- In one variant of the process, the ethylenically unsaturated compound is selected from 1-pentene, cis- and/or trans-2-pentene, 2-methyl-1-butene, 2-methyl-2-butene, 3-methyl-1-butene, or mixtures thereof.
- In a preferred embodiment, the ethylenically unsaturated compound is selected from ethene, propene, 1-butene, cis- and/or trans-2-butene, isobutene, 1,3-butadiene, 1-pentene, cis- and/or trans-2-pentene, 2-methyl-1-butene, 3-methyl-1-butene, 2-methyl-2-butene, hexene, tetramethylethylene, heptene, n-octene, 1-octene, 2-octene, or mixtures thereof.
- In one variant, a mixture of ethylenically unsaturated compounds is used. A mixture in the context of this invention refers to a composition comprising at least two different ethylenically unsaturated compounds, where the proportion of each individual ethylenically unsaturated compound is preferably at least 5% by weight, based on the total weight of the mixture.
- Preference is given to using a mixture of ethylenically unsaturated compounds each having 2 to 30 carbon atoms, preferably 4 to 22 carbon atoms, more preferably 6 to 12 carbon atoms, most preferably 8 to 10 carbon atoms.
- Suitable mixtures of ethylenically unsaturated compounds are those called raffinates I to III. Raffinate I comprises 40% to 50% isobutene, 20% to 30% 1-butene, 10% to 20% cis- and trans-2-butene, up to 1% 1,3-butadiene and 10% to 20% n-butane and isobutane. Raffinate II is a portion of the C4 fraction which arises in naphtha cracking and consists essentially of the isomeric n-butenes, isobutane and n-butane after removal of isobutene from raffinate I. Raffinate III is a portion of the C4 fraction which arises in naphtha cracking and consists essentially of the isomeric n-butenes and n-butane.
- A further suitable mixture is di-n-butene, also referred to as dibutene, DNB or DnB. Di-n-butene is an isomer mixture of C8 olefins which arises from the dimerization of mixtures of 1-butene, cis-2-butene and trans-2-butene. In industry, raffinate II or raffinate III streams are generally subjected to a catalytic oligomerization, wherein the butanes present (n/iso) emerge unchanged and the olefins present are converted fully or partly. As well as dimeric di-n-butene, higher oligomers (tributene C12, tetrabutene C16) generally also form, which are removed by distillation after the reaction. These can likewise be used as reactants.
- In a preferred variant, a mixture comprising isobutene, 1-butene, cis- and trans-2-butene is used. Preferably, the mixture comprises 1-butene, cis- and trans-2-butene.
- The alkoxycarbonylation according to the invention is catalysed by the Pd complex according to the invention. The Pd complex may either be added in process step b) as a preformed complex comprising Pd and the phosphine ligands according to the invention or be formed in situ from a compound comprising Pd and the free phosphine ligand. In this context, the compound comprising Pd is also referred to as catalyst precursor.
- In the case that the catalyst is formed in situ, the ligand can be added in excess, such that the unbound ligand is also present in the reaction mixture.
- In one variant, the compound comprising Pd is selected from palladium chloride (PdCl2), palladium(II) acetylacetonate [Pd(acac)2], palladium(II) acetate [Pd(OAc)2], dichloro(1,5-cyclooctadiene)palladium(II) [Pd(cod)2Cl2], bis(dibenzylideneacetone)palladium [Pd(dba)2], bis(acetonitrile)dichloropalladium(ll) [Pd(CH3CN)2Cl2], palladium(cinnamyl) dichloride [Pd(cinnamyl)Cl2].
- Preferably, the compound comprising Pd is PdCl2, Pd(acac)2 or Pd(OAc)2. PdCl2 is particularly suitable.
- The alcohol in process step c) may be branched or linear, cyclic, alicyclic, partly cyclic or aliphatic, and is especially a C1- to C30-alkanol. It is possible to use monoalcohols or polyalcohols.
- The alcohol in process step c) comprises preferably 1 to 30 carbon atoms, more preferably 1 to 22 carbon atoms, especially preferably 1 to 12 carbon atoms. It may be a monoalcohol or a polyalcohol.
- The alcohol may, in addition to the one or more hydroxyl groups, contain further functional groups. Preferably, the alcohol may additionally comprise one or more functional groups selected from carboxyl, thiocarboxyl, sulpho, sulphinyl, carboxylic anhydride, imide, carboxylic ester, sulphonic ester, carbamoyl, sulphamoyl, cyano, carbonyl, carbonothioyl, sulphhydryl, amino, ether, thioether, aryl, heteroaryl or silyl groups and/or halogen substituents.
- In one embodiment, the alcohol does not comprise any further functional groups except for hydroxyl groups.
- The alcohol may contain unsaturated and aromatic groups. However, it is preferably an aliphatic alcohol.
- An aliphatic alcohol in the context of this invention refers to an alcohol which does not comprise any aromatic groups, i.e., for example, an alkanol, alkenol or alkynol. Unsaturated nonaromatic alcohols are thus also permitted.
- In one embodiment, the alcohol is an alkanol having one or more hydroxyl groups and 1 to 30 carbon atoms, preferably 1 to 22 carbon atoms, more preferably 1 to 12 carbon atoms, most preferably 1 to 6 carbon atoms.
- In one variant of the process, the alcohol in process step c) is selected from the group of the monoalcohols.
- In one variant of the process, the alcohol in process step c) is selected from: methanol, ethanol, 1-propanol, isopropanol, isobutanol, tert-butanol, 1-butanol, 2-butanol, 1-pentanol, 2-pentanol, 3-pentanol, 1-hexanol, cyclohexanol, phenol, 2-ethylhexanol, isononanol, 2-propylheptanol.
- In a preferred variant, the alcohol in process step c) is selected from methanol, ethanol, 1-propanol, 1-butanol, 1-pentanol, 1-hexanol, 2-propanol, tert-butanol, 3-pentanol, cyclohexanol, phenol, and mixtures thereof.
- In one variant of the process, the alcohol in process step c) is selected from the group of the polyalcohols.
- In one variant of the process, the alcohol in process step c) is selected from: diols, triols, tetraols.
- In one variant of the process, the alcohol in process step c) is selected from: cyclohexane-1,2-diol, ethane-1,2-diol, propane-1,3-diol, glycerol, butane-1,2,4-triol, 2-hydroxymethylpropane-1,3-diol, 1,2,6-trihydroxyhexane, pentaerythritol, 1,1,1-tri(hydroxymethyl)ethane, catechol, resorcinol and hydroxyhydroquinone.
- In one variant of the process, the alcohol in process step c) is selected from: sucrose, fructose, mannose, sorbose, galactose and glucose.
- In a preferred embodiment of the process, the alcohol in process step c) is selected from methanol, ethanol, 1-propanol, 1-butanol, 1-pentanol, 1-hexanol.
- In a particularly preferred variant of the process, the alcohol in process step c) is selected from: methanol, ethanol.
- In a particularly preferred variant of the process, the alcohol in process step c) is methanol.
- In one variant of the process, the alcohol in process step c) is used in excess.
- In one variant of the process, the alcohol in process step c) is used simultaneously as solvent.
- In one variant of the process, a further solvent is used, selected from: toluene, xylene, tetrahydrofuran (THF) and methylene chloride (CH2Cl2).
- CO is fed in in step d) preferably at a partial CO pressure between 0.1 and 10 MPa (1 to 100 bar), preferably between 1 and 8 MPa (10 to 80 bar), more preferably between 2 and 4 MPa (20 to 40 bar).
- The reaction mixture is heated in step e) of the process according to the invention preferably to a temperature between 10° C. and 180° C., preferably between 20 and 160° C., more preferably between 40 and 120° C., in order to convert the ethylenically unsaturated compound to an ester.
- The molar ratio of the ethylenically unsaturated compound initially charged in step a) to the alcohol added in step c) is preferably between 1:1 and 1:20, more preferably 1:2 to 1:10, more preferably 1:3 to 1:4.
- The mass ratio of Pd to the ethylenically unsaturated compound initially charged in step a) is preferably between 0.001% and 0.5% by weight, preferably between 0.01% and 0.1% by weight, more preferably between 0.01% and 0.05% by weight.
- The molar ratio of the diphosphine compound according to the invention to Pd is preferably between 0.1:1 and 400:1, preferably between 0.5:1 and 400:1, more preferably between 1:1 and 100:1, most preferably between 2:1 and 50:1.
- Preferably, the process is conducted with addition of an acid. In one variant, the process therefore additionally comprises step c′): adding an acid to the reaction mixture. This may preferably be a Brønsted or Lewis acid.
- Suitable Brønsted acids preferably have an acid strength of pKa≧5, preferably an acid strength of pKa≧3. The reported acid strength pKa is based on the pKa determined under standard conditions (25° C., 1.01325 bar). In the case of a polyprotic acid, the acid strength pKa in the context of this invention relates to the pKa of the first protolysis step.
- Preferably, the acid is not a carboxylic acid.
- Suitable Brønsted acids are, for example, perchloric acid, sulphuric acid, phosphoric acid, methylphosphonic acid and sulphonic acids. Preferably, the acid is sulphuric acid or a sulphonic acid. Suitable sulphonic acids are, for example, methanesulphonic acid, trifluoromethanesulphonic acid, tert-butanesulphonic acid, p-toluenesulphonic acid (PTSA), 2-hydroxypropane-2-sulphonic acid, 2,4,6-trimethylbenzenesulphonic acid and dodecylsulphonic acid. Particularly preferred acids are sulphuric acid, methanesulphonic acid, trifluoromethanesulphonic acid and p-toluenesulphonic acid.
- A Lewis acid used may, for example, be aluminium triflate.
- In one embodiment, the amount of acid added in step c′) is 0.3 to 40 mol %, preferably 0.4 to 15 mol %, more preferably 0.5 to 5 mol %, most preferably 0.6 to 3 mol %, based on the molar amount of the ethylenically unsaturated compound used in step a).
- The examples which follow illustrate the invention.
- General Procedures
- All the preparations which follow were carried out under protective gas using standard Schlenk techniques. The solvents were dried over suitable desiccants before use (Purification of Laboratory Chemicals, W. L. F. Armarego (Author), Christina Chai (Author), Butterworth Heinemann (Elsevier), 6th edition, Oxford 2009).
- Phosphorus trichloride (Aldrich) was distilled under argon before use. All preparative operations were effected in baked-out vessels. The products were characterized by means of NMR spectroscopy. Chemical shifts (δ) are reported in ppm. The 31P NMR signals were referenced as follows: SR31P═SR1H*(BF31P/BF1H)═SR1H*0.4048. (Robin K. Harris, Edwin D. Becker, Sonia M. Cabral de Menezes, Robin Goodfellow, and Pierre Granger, Pure Appl. Chem., 2001, 73, 1795-1818; Robin K. Harris, Edwin D. Becker, Sonia M. Cabral de Menezes, Pierre Granger, Roy E. Hoffman and Kurt W. Zilm, Pure Appl. Chem., 2008, 80, 59-84).
- The recording of nuclear resonance spectra was effected on Bruker Avance 300 or Bruker Avance 400, gas chromatography analysis on Agilent GC 7890A, elemental analysis on Leco TruSpec CHNS and Varian ICP-OES 715, and ESI-TOF mass spectrometry on Thermo Electron Finnigan MAT 95-XP and Agilent 6890 N/5973 instruments.
- The Grignard for the synthesis of chloro-2-pyridyl-t-butylphosphine is prepared by the “Knochel method” with isopropylmagnesium chloride (Angew. Chem. 2004, 43, 2222-2226). The workup is effected according to the method of Budzelaar (Organometallics 1990, 9, 1222-1227).
- 8.07 ml of a 1.3 M isopropylmagnesium chloride solution (Knochel's reagent) are introduced into a 50 ml round-bottom flask with magnetic stirrer and septum, and cooled to −15° C. Thereafter, 953.5 μl (10 mmol) of 2-bromopyridine are rapidly added dropwise. The solution immediately turns yellow. It is allowed to warm up to −10° C. The conversion of the reaction is determined as follows: about 100 μl solution are taken and introduced into 1 ml of a saturated ammonium chloride solution. If the solution “bubbles”, not much Grignard has formed yet. The aqueous solution is extracted with a pipette of ether and the organic phase is dried over Na2SO4. A GC of the ethereal solution is recorded. When a large amount of pyridine has formed compared to 2-bromopyridine, conversions are high. At −10° C., there has been little conversion. After warming up to room temperature and stirring for 1-2 hours, the reaction solution turns brown-yellow. A GC test shows complete conversion. Now the Grignard solution can be slowly added dropwise with a syringe pump to a solution of 1.748 g (11 mmol) of dichloro-tert-butylphosphine in 10 ml of THF which has been cooled to −15° C. beforehand. It is important that the dichloro-tert-butylphosphine solution is cooled. At room temperature, considerable amounts of dipyridyl-tert-butylphosphine would be obtained. A clear yellow solution is initially formed, which then turns cloudy. The mixture is left to warm up to room temperature and to stir overnight. According to GC-MS, a large amount of product has formed. The solvent is removed under high vacuum and a whitish solid which is brown in places is obtained. The solid is suspended with 20 ml of heptane and the solid is comminuted in an ultrasound bath. After allowing the white solid to settle out, the solution is decanted. The operation is repeated twice with 10-20 ml each time of heptane. After concentration of the heptane solution under high vacuum, it is distilled under reduced pressure. At 4.6 mbar, oil bath 120° C. and distillation temperature 98° C., the product can be distilled. 1.08 g of a colourless oil are obtained. (50%).
- Analytical data: 1H NMR (300 MHz, C6D6): δ 8.36 (m, 1H, Py), 7.67 (m, 1H, Py), 7.03-6.93 (m, 1H, Py), 6.55-6.46 (m, 1H, Py), 1.07 (d, J=13.3 Hz, 9H, t-Bu).
- 13C NMR (75 MHz, C6D6): δ 6 162.9, 162.6, 148.8, 135.5, 125.8, 125.7, 122.8, 35.3, 34.8, 25.9 and 25.8.
- 31P NMR (121 MHz, C6D6) δ 97.9.
- MS (El) m:z (relative intensity) 201 (M+,2), 147 (32), 145 (100), 109 (17), 78 (8), 57.1 (17).
-
- 675 mg (27.8 mmol, 4 equivalents) of Mg powder are weighed out in a glovebox in a 250 ml round-bottom flask with a nitrogen tap and magnetic stirrer bar, and the flask is sealed with a septum. High vacuum is applied to the round-bottom flask (about 5×10−2 mbar) and it is heated to 90° C. for 45 minutes. After cooling down to room temperature, 2 grains of iodine are added and the mixture is dissolved in 20 ml of THF. The suspension is stirred for about 10 minutes until the yellow colour of the iodine has disappeared. After the magnesium powder has settled out, the cloudy THF solution is decanted and the activated magnesium powder is washed twice with 1-2 ml of THF. Then another 20 ml of fresh THF are added. At room temperature, a solution of 755.5 μl (6.9 mmol) of 1,4-dichlorobutane in 70 ml of THF is slowly added dropwise with a syringe pump. The THF solution is clear and pale yellow. The next day, the solution is dark grey but clear and is filtered through Celite. A sample of the Grignard solution is quenched and examined in GC as follows:
- 300 μl of Grignard solution is quenched with 1 ml of a saturated aqueous solution of NH4Cl and extracted with ether. After drying over Na2SO4, a GC of the ether solution is recorded. 1,4-Dichlorobutane is no longer detectable, but the butane formed cannot be observed in the GC.
- The content of Grignard compound is determined as follows:
- 1 ml of Grignard solution is quenched with 3 ml of 0.1 M HCl and the excess acid is titrated with 0.1 M NaOH. A suitable indicator is an aqueous 0.04% bromocresol solution. The colour change goes from yellow to blue. 1.70 ml of 0.1 M NaOH has been consumed. 3 ml−1.70 ml=1.3 ml, corresponding to 0.13 mmol of Grignard compound. Since a di-Grignard is present, the Grignard solution is 0.065 M.
- Based on 90 ml of solution this is 85% of Grignard solution. The Grignard can now be reacted with the chlorophosphine:
- In a 250 ml three-neck flask with reflux condenser, magnetic stirrer bar and nitrogen tap, under argon, 1.94 g (9.75 mmol, 2.5 eq) of chloro-2-pyridyl-t-butylphosphine (precursor A) are dissolved in 10 ml of THF and cooled to −60° C. Then 60 ml of the above-stipulated Grignard solution (0.065 M, 3.9 mmol) are slowly added dropwise at this temperature with a syringe pump. The solution at first remains clear and then turns intense yellow. The mixture is left to warm up to room temperature overnight and a clear yellow solution is obtained. To complete the reaction, the mixture is heated under reflux for 2 hours. After cooling, 1 ml of H2O is added and the solution loses colour and a white solid precipitates out. After removing THF under high vacuum, a stringy, pale yellow solid is obtained. 15 ml of water and 20 ml of ether are added thereto, and two homogeneous clear phases are obtained, which have good separability. The aqueous phase is extracted twice with ether. After the organic phase has been dried with Na2SO4, the ether is removed under high vacuum and a viscous, almost colourless oil is obtained. The latter is dissolved in 4 ml of MeOH while heating on a water bath and filtered through Celite. At −28° C., 660 mg of product are obtained in the form of white tacky crystals overnight. (44%).
- 1H NMR (300 MHz, C6D6): δ 8.54 (m, 2H, py), 7.37 (m, 2H, py), 6.96 (m, 2H, Py), 6.58 (m, 2H, Py), 2.68 (m, 2H, CH2), 1.74 (m, 4H, CH2), 1.52 (m; 2H, CH2), 1.03 (d, J=11.5 Hz, 18H, tBu).
- 13C NMR (75 MHz, C6D6): δ 6 162.8, 162.5 (q), 149.9, 134.3, 134.1, 132.0, 131.5 and 122.4 (py), 29.4, 29.3, 29.1, 29.0, 20.7, 20.5 (CH2), 28.1 and 27.9 (tBu).
- 31P NMR (121 MHz, C6D6) δ 8.2.
- HRMS (ESI) m/z+ calculated for: C22H34N2P2 (M+H)+ 389.227; found: 389.2273. EA calculated for: C22H34N2P2: C, 68.02; H, 8.82; N, 7.21; P,15.95. found: C, 68.16; H, 8.97; N, 7.07; P,15.91.
-
- In a 100 ml round-bottom flask with nitrogen tap and magnetic stirrer bar, 214.7 mg (0.679 mmol) of diadamantylphosphine borane adduct are weighed out. The flask is closed with a septum and, after purging with argon, 10 ml of THF are added. The borane adduct has good solubility in THF, and a clear colourless solution is obtained, which is cooled to −78° C. with dry ice. After stirring for 15 minutes, 0.5 ml (0.70 mmol) of a 1.4 M sec-BuLi solution is slowly added dropwise. After the dropwise addition, a pale yellowish, clear solution is obtained, which is brought to room temperature within 3 hours. The still pale yellowish solution is left to stir at room temperature for a further hour and the solution is cooled back to −78° C. Then 42.6 μl (0.323 mmol) of diiodobutane diluted with 5 ml of THF are slowly added dropwise to this solution. The yellow solution loses colour in the process. The mixture is left to warm up overnight, and a large amount of white solid precipitates out. 8 ml of water are added and the mixture is stirred vigorously for 20 minutes. Further solid floats on top of the solution. The solution is decanted and the white solid is washed three times with MeOH in order to remove any water still present. After drying under reduced pressure, a yield of 210 mg (95%) of a white solid is obtained.
- 1H NMR (300 MHz, CDCl3): δ 2.11-1.89 (m, 36H, Ad), 1.79-1.68 (m, 24H, Ad), 1.67-1.49 (m, 8H, CH2), 1.03-(−0.51) (m, broad), 6H, BH3).
- 13C NMR (75 MHz, CDCl3): δ 37.8 and 36.6 (Ad), 36.5 and 36.4 (C), 28.1 and 28.0 (Ad), 27.9, 27.7, 15.1 and 14.7 ((CH2)4).
- 31P NMR (121 MHz, CDCl3) δ 6 36.6-33.4 (m).
-
- 4.0 g (13.22 mmol) of diadamantylphosphine are weighed out in a 100 ml round bottom flask with nitrogen tap and oval magnetic stirrer bar, closed with a septum and purged. The solid is suspended in 9 ml of THF and 18.9 ml (18.9 mmol, 1 M) of BH3·THF adduct are added rapidly to this suspension. The suspension at first begins to dissolve. After a while, however, a white solid precipitates out. The mixture is left to stir overnight and the THF is removed under high vacuum. The white residue is taken up in 250 ml of ethyl acetate while heating (60° C.) on a water bath. The borane adduct has good solubility in the warm ethyl acetate. After addition of 6 spoonfuls of silica gel 60 (about 12 g), the solvent is removed completely on a rotary evaporator and the product which has been absorbed on silica gel is chromatographed with a Combi-Flash apparatus. The eluent used is 1:10 (ethyl acetate/heptane). 3.1 g (74%) of diadamantylphosphine borane adduct are obtained.
- 1H NMR (300 MHz, CDCl3): δ 6 3.71 (dq, 350.8 Hz and 6.6 Hz, 1H, PH), 2.01-1.94 (m, 18H, Ad), 1.74 (m, 12H, Ad), 1.05-(−0.35) (m, 3H, BH3).
- 13C NMR (75 MHz, CDCl3): δ 37.9 and 36.4 (CH2), 34.8 and 34.4 (C), 28.1 and 28.0 (CH).
- 31P NMR (121 MHz, CDCl3) δ 42.8-40.0 (m).
-
- 500 mg (0.728 mmol) of borane adduct are weighed out in a 25 ml round-bottom flask with nitrogen tap, and 10 ml of absolute pyrrolidine are added. The suspension is heated under reflux until the solution is colourless and clear (about 2 h). After cooling, the pyrrolidine is removed under high vacuum and a white residue was obtained. This is taken up in 15 ml of toluene and heated to 90° C. The almost clear solution is difficult to filter, since the product precipitates out again in the course of cooling. A white crystalline solid precipitates out of the filtrate in the refrigerator (3° C.). Crystals are washed twice with toluene and dried under high vacuum. 300 mg (62%) of white crystals are obtained.
- Owing to poor solubility at room temperature, a 1H, 13C and 31P NMR in benzene-d6 is recorded at 323 K.
- 1H NMR (323 K, 400 MHz, C6D6): δ 2.12-1.92 (m, 16H, CH2, Ad), 1.92-1.79 (m, 11H, CH2, Ad), 1.75-1.64 (m, 16H, CH2, Ad), 1.64-1.47 (m, 6H, CH2, Ad), 1.45-1.23 (m, 18H, CH2, Ad).
- 13C NMR (323 K, 100 MHz, C6D6): δ 41.5 and 41.4 (Ad), 37.5 (Ad), 36.5 and 36.3 (C), 30.1 (CH2), 29.3 and 29.2 (Ad), 17.5 and 17.3 (CH2).
- 31P NMR (323 K, 162 MHz, C6D6) δ 25.71.
- High-Pressure Experiments
- Feedstocks:
- Di-n-butene was also referred to as follows: dibutene, DNB or DnB.
- Di-n-butene is an isomer mixture of C8 olefins which arises from the dimerization of mixtures of 1-butene, cis-2-butene and trans-2-butene. In industry, raffinate II or raffinate III streams are generally subjected to a catalytic oligomerization, wherein the butanes present (n/iso) emerge unchanged and the olefins present are converted fully or partly. As well as dimeric di-n-butene, higher oligomers (tributene C12, tetrabutene C16) generally also form, which have to be removed by distillation after the reaction.
- Another process practised in industry for oligomerization of C4 olefins is called the “OCTOL process”.
- Within the patent literature, DE102008007081A1, for example, describes an oligomerization based on the OCTOL process. EP1029839A1 is concerned with the fractionation of the C8 olefins formed in the OCTOL process.
- Technical di-n-butene consists generally to an extent of 5% to 30% of n-octenes, 45% to 75% of 3-methylheptenes, and to an extent of 10% to 35% of 3,4-dimethylhexenes. Preferred streams contain 10% to 20% n-octenes, 55% to 65% 3-methylheptenes, and 15% to 25% 3,4-dimethylhexenes.
- para-Toluenesulphonic acid was abbreviated as follows: pTSA, PTSA or p-TSA. PTSA in this text always refers to para-toluenesulphonic acid monohydrate.
- General Method for Performance of the High-Pressure Experiments
- General Experimental Method for Autoclave Experiments in Glass Vials:
- A 300 ml Parr reactor is used. Matched to this is an aluminium block of corresponding dimensions which has been manufactured in-house and which is suitable for heating by means of a conventional magnetic stirrer, for example from Heidolph. For the inside of the autoclave, a round metal plate of thickness about 1.5 cm was manufactured, containing 6 holes corresponding to the external diameter of the glass vials. Matching these glass vials, they are equipped with small magnetic stirrers. These glass vials are provided with screw caps and suitable septa and charged, using a special apparatus manufactured by glass blowers, under argon with the appropriate reactants, solvents and catalysts and additives. For this purpose, 6 vessels are filled at the same time; this enables the performance of 6 reactions at the same temperature and the same pressure in one experiment. Then these glass vessels are closed with screw caps and septa, and a small syringe cannula of suitable size is used to puncture each of the septa. This enables gas exchange later in the reaction. These vials are then placed in the metal plate and these are transferred into the autoclave under argon. The autoclave is purged with CO and filled at room temperature with the CO pressure intended. Then, by means of the magnetic stirrer, under magnetic stirring, the autoclave is heated to reaction temperature and the reaction is conducted for the appropriate period. Subsequently, the autoclave is cooled down to room temperature and the pressure is slowly released. Subsequently, the autoclave is purged with nitrogen. The vials are taken from the autoclave, and a defined amount of a suitable standard is added. A GC analysis is effected, the results of which are used to determine yields and selectivities.
- Analysis
- GC analysis of di-n-butene: for the GC analysis, an Agilent 7890A gas chromatograph having a 30 m HP5 column is used. Temperature profile: 35° C., 10 min; 10° C./min to 200° C.; the injection volume is 1 μl with a split of 50:1.
- Retention times for di-n-butene and products: 10.784-13.502 min
- The esters formed from di-n-butene are referred to hereinafter as MINO (methyl isononanoate).
- Retention time for ether products of unknown isomer distribution: 15.312, 17.042, 17.244, 17.417 min
- Retention time for iso-C9 esters 19.502-20.439 min (main peak: 19.990 min)
- Retention time for n-C9 esters: 20.669, 20.730, 20.884, 21.266 min.
- Evaluation of the Experiments
- For the evaluation of the catalytic experiments, particular indicators which permit comparison of the various catalyst systems are used hereinafter.
- TON: turnover number, defined as moles of product per mole of catalyst metal, is a measure of the productivity of the catalytic complex.
- TOF: turnover frequency, defined as TON per unit time for the attainment of a particular conversion, e.g. 50%. The TOF is a measure of the activity of the catalytic system.
- The n selectivities reported hereinafter relate to the proportion of terminal methoxycarbonylation based on the overall yield of methoxycarbonylation products.
- The n/iso ratio indicates the ratio of olefins converted terminally to esters to olefins converted internally to esters.
- Ligand 2 (comparative example): A 25 ml Schlenk vessel was charged with a stock solution of [Pd(acac)2] (1.95 mg, 6.4 μmol), p-toluenesulphonic acid (PTSA) (18.24 mg, 95.89 μmol) and MeOH (10 ml). A 4 ml vial was charged with 2 (2.11 mg, 0.16 mol % based on the molar amount of di-n-butene), and a magnetic stirrer bar was added. Thereafter, 1.25 ml of the clear yellow stock solution and di-n-butene (315 μl, 2 mmol) were added with a syringe. The molar proportions based on the molar amount of di-n-butene are thus 0.04 mol % for Pd(acac)2 and 0.6 mol % for PTSA. The vial was placed into a sample holder which was in turn inserted into a 300 ml Parr autoclave under an argon atmosphere. After the autoclave had been purged three times with nitrogen, the CO pressure was adjusted to 40 bar. The reaction proceeded at 120° C. for 20 hours. On conclusion of the reaction, the autoclave was cooled down to room temperature and cautiously decompressed. Isooctane was added as internal GC standard. Yield and regioselectivity were determined by means of GC. No MINO formation was observed.
- Ligand 1: A 25 ml Schlenk vessel was charged with a stock solution of [Pd(acac)2] (1.95 mg, 6.4 μmol), p-toluenesulphonic acid (PTSA) (18.24 mg, 95.89 μmol) and MeOH (10 ml). A 4 ml vial was charged with 1 (1.24 mg, 0.16 μmol % based on the molar amount of di-n-butene), and a magnetic stirrer bar was added. Thereafter, 1.25 ml of the clear yellow stock solution and di-n-butene (315 μl, 2 mmol) were added with a syringe. The molar proportions based on the molar amount of di-n-butene are thus 0.04 mol % for Pd(acac)2 and 0.6 mol % for PTSA. The vial was placed into a sample holder which was in turn inserted into a 300 ml Parr autoclave under an argon atmosphere. After the autoclave had been purged three times with nitrogen, the CO pressure was adjusted to 40 bar. The reaction proceeded at 120° C. for 20 hours. On conclusion of the reaction, the autoclave was cooled down to room temperature and cautiously decompressed. Isooctane was added as internal GC standard. Yield and regioselectivity were determined by means of GC. (MINO yield: 13%, n/iso regioselectivity: 59/41).
- This experiment shows that the inventive ligand 1 forms a catalytically active palladium complex which catalyses the alkoxycarbonylation of di-n-butene. The structurally similar ligand 2, by contrast, is unsuitable for catalysing alkoxycarbonylation.
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