US20070004936A1 - Method for producing ester condensed product - Google Patents

Method for producing ester condensed product Download PDF

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US20070004936A1
US20070004936A1 US10/574,056 US57405606A US2007004936A1 US 20070004936 A1 US20070004936 A1 US 20070004936A1 US 57405606 A US57405606 A US 57405606A US 2007004936 A1 US2007004936 A1 US 2007004936A1
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compound
preparing
catalyst
ester
ester condensate
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Kazuaki Ishihara
Hisashi Yamamoto
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Japan Science and Technology Agency
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Publication of US20070004936A1 publication Critical patent/US20070004936A1/en
Priority to US12/393,519 priority Critical patent/US7973193B2/en
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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C67/00—Preparation of carboxylic acid esters
    • C07C67/08—Preparation of carboxylic acid esters by reacting carboxylic acids or symmetrical anhydrides with the hydroxy or O-metal group of organic compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
    • B01J31/02—Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides
    • B01J31/0201—Oxygen-containing compounds
    • B01J31/0211—Oxygen-containing compounds with a metal-oxygen link
    • B01J31/0212—Alkoxylates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
    • B01J31/16—Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes
    • B01J31/22—Organic complexes
    • B01J31/2204—Organic complexes the ligands containing oxygen or sulfur as complexing atoms
    • B01J31/2208—Oxygen, e.g. acetylacetonates
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D307/00—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom
    • C07D307/02—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings
    • C07D307/04—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings having no double bonds between ring members or between ring members and non-ring members
    • C07D307/18—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings having no double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
    • C07D307/24—Carbon atoms having three bonds to hetero atoms with at the most one bond to halogen
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2231/00—Catalytic reactions performed with catalysts classified in B01J31/00
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2531/00—Additional information regarding catalytic systems classified in B01J31/00
    • B01J2531/30—Complexes comprising metals of Group III (IIIA or IIIB) as the central metal
    • B01J2531/32—Gallium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2531/00—Additional information regarding catalytic systems classified in B01J31/00
    • B01J2531/40—Complexes comprising metals of Group IV (IVA or IVB) as the central metal
    • B01J2531/48—Zirconium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2531/00—Additional information regarding catalytic systems classified in B01J31/00
    • B01J2531/40—Complexes comprising metals of Group IV (IVA or IVB) as the central metal
    • B01J2531/49—Hafnium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2531/00—Additional information regarding catalytic systems classified in B01J31/00
    • B01J2531/80—Complexes comprising metals of Group VIII as the central metal
    • B01J2531/84—Metals of the iron group
    • B01J2531/842—Iron
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C2601/00—Systems containing only non-condensed rings
    • C07C2601/18—Systems containing only non-condensed rings with a ring being at least seven-membered
    • C07C2601/20—Systems containing only non-condensed rings with a ring being at least seven-membered the ring being twelve-membered

Definitions

  • the present invention relates to a method for preparing an ester condensate and a catalyst used therefor. More specifically, the present invention relates to a method for preparing an ester condensate and a catalyst used therefor, wherein the method allows preparation of the ester condensate in good yield from equimolar amounts of materials and allows reuse of the recovered catalysts repeatedly, as well as it cuts waste of resources significantly, provides effective use of resources, and reduces environmental destruction.
  • Esterification reaction which is the most basic reaction of organic synthesis, is an important reaction having a great utility value also from the view point of an environmentally-friendly chemical process.
  • An enormous amount of reports have already been made concerning the esterification reaction, but there were problems as follows in view of green chemistry and atom efficiency: one equivalent weight or more of condensing reagent or activator was used for a substrate in many cases; a large quantity of by-products was generated through the reaction, thereby complicated operations for separation and purification become necessary after the reaction; unless either of carboxylic acid or alcohol was used excessively, it was impossible to prepare ester efficiently in many cases (see, e.g. Japanese Laid-Open Patent Application No. 52-75684; Synthesis. 1978, p. 929; Chem.
  • a polyester polymerized catalyst comprising a structure of Ar—O— (Ar represents an aryl group) and the like and one or more of metal compounds selected from the group of scandium, yttrium, zirconium, hafnium, and vanadium, and (see, e.g. Japanese Laid-Open Patent Application No.
  • an ester polycondensation catalyst comprising an aluminum compound and a metal compound other than aluminum
  • a method for preparing an aliphatic polyester wherein a germanium compound and at least one of the metal compounds selected from the group of titanium, antimony, zirconium, iron and the like, are used as a catalyst
  • a germanium compound and at least one of the metal compounds selected from the group of titanium, antimony, zirconium, iron and the like are used as a catalyst
  • a catalyst for preparing polyester wherein a compound comprising at least one of the elements selected from the group of beryllium, magnesium, calcium, hafnium, iron and the like and a hydrolysate of a titanium halide (see, e.g. Japanese Laid-Open Patent Applications Nos. 2001-48973 and 2001-64377), and a transesterification catalyst, wherein phosphate ion is contained in one or more of metal oxide and/or metal hydroxide selected from the group of aluminum, zirconium and iron (see, e.g. Japanese Laid Open-Patent Application No. 2001-17862).
  • the object of the present invention is to provide a method for preparing an ester condensate and a catalyst therefor; wherein the method enables to synthesize enormous amounts of ester condensates comprising a specific structure in good yield, by a reaction of carboxylic acids and alcohols in equimolar amounts, while generation of by-products is prevented in the synthesis of organic compounds such as the pharmaceuticals; and wherein the catalyst exhibits a good catalytic efficiency as a catalyst for use, the use of the catalyst in small amount is sufficient, and the catalyst being reusable can be used repeatedly; therefore, the method for preparing an ester condensate can be applied to industrial methods which are preferable also in view of green chemistry.
  • the catalytic activity is improved by adding metal salts such as Ga(Oi-Pr) 3 , Fe(Oi-Pr) 3 , Al(Oi-Pr) 3 , Sn(Oi-Pr) 4 and the like as additives.
  • metal salts such as Ga(Oi-Pr) 3 , Fe(Oi-Pr) 3 , Al(Oi-Pr) 3 , Sn(Oi-Pr) 4 and the like as additives.
  • metal salts such as Ga(Oi-Pr) 3 , Fe(Oi-Pr) 3 , Al(Oi-Pr) 3 , Sn(Oi-Pr) 4 and the like as additives.
  • Ga(Oi-Pr) 3 and Fe(Oi-Pr) 3 brought particularly good results. Single use of 3 mol % of these additives for performing the reaction in stead of Zr(IV) salt could not induce excellent activity.
  • Ti(Oi-Pr) 4 is also known as a catalyst having high activity as well as Zr(IV) or Hf(IV) salts, synergistic improvement of the catalytic activity could not be observed by using the combinations of Ti(IV)-Zr(IV), Zr(IV)-Hf(IV), and Ti(IV)-Hf(IV).
  • Hf(IV) salt When the reaction was performed similarly by using Hf(IV) salt, a similar effect to the additive effect on Zr(IV) salt could be obtained.
  • ester condensation reaction was carried out with 3 mol % of Zr(Oi-Pr) 4 and 4 mol % of Fe(Oi-Pr) 4 , then 1 M hydrochloric acid solution was added thereto and ester was obtained from the organic layer by extraction.
  • metal salt was recovered from the aqueous layer, carboxylic acid, alcohol and a reaction solvent were added to the aqueous solution again without concentration, and azeotropic dehydration was carried out by heating to reflux. It was followed by ester condensation reaction proceeding as in the case of the first reaction.
  • the present inventors obtained knowledge that the catalyst can be recovered and reused by repeating this series of operations.
  • esterification reaction was carried out under heating to ref lux with the use of the mixture of Zr(Oi-Pr) 4 or Hf(Oi-Pr) 4 and Fe(Oi-Pr) 3 as a catalyst with azeotropic dehydration in a mixed solvent of a low-polar organic solvent and an ionic liquid. After the reaction was finished, the solution was left at room temperature for sometime, and then it was found that the solution was separated into two layers of an organic solvent layer and an ionic liquid layer. Ester was obtained from the organic layer in the upper part in good yield.
  • the present invention still further relates to: [21] the catalyst for preparing an ester condensate according to [17], wherein the hafnium (IV) compound is a compound represented by a general formula (4): ZrX 4 Y f (4), (wherein X represents a halogen atom, Y represents tetrahydrofuran, and f represents 0 or 2); [22] the catalyst for preparing an ester condensate according to any one of [17] to [21], wherein the iron compound is iron(III) alkoxide, and the gallium compound is gallium(III) alkoxide; [23] the catalyst for preparing an ester condensate according to any one of [17] to [22], wherein the abundance of the iron compound is 5 mol % or more in relation to the zirconium (IV) compound and/or the hafnium (IV) compound; [24] the catalyst for preparing an ester condensate according to any one of [17] to [23], wherein
  • FIG. 1 represents the relationship between content rate of iron(III) isopropoxide to zirconium(IV) isoproxide and the ester conversion.
  • esterification reaction is carried out by using a catalyst containing a zirconium(IV) compound and/or a hafnium(IV) compound and an iron(III) compound and/or a gallium(III) compound.
  • esterification reaction of the method for preparing an ester condensate of the present invention reactions such as a reaction of carboxylic acid and alcohol, a reaction of polycarboxylic acid and multiple alcohol, and so on can be exemplified.
  • carboxylic acid used in the esterification reaction any one of monocarboxylic acid of the group comprising chain or cyclic fatty acids or aromatic acids and monocarboxylic acids having unsaturated bond or substituents thereto can be used.
  • fatty acids such as caproic acid, enanthic acid, caprylic acid, pelargonic acid, capric acid,
  • dicarboxylic acids such as malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, dodecanedioic acid, fumaric acid, maleic acid, mesaconic acid, citraconic acid, phthalic acid, terephtalic acid, isophtalic acid, and diphenyl ether-4,4′-dicarboxylic acid; tricarboxylic acids such as butane-1,2,4-tricarboxylic acid, cyclohexane-1,2,3-tricarboxylic acid, benzene-1,2,4-tricarboxylic acid, and naphthalene-1,2,4-tricarboxylic acid; tetracarboxylic acids such as butane-1,2,3,4-tetracarboxylic acid, cyclobutane-1,2,3,
  • the alcohol used for the esterification in the present invention may be primary, secondary, or tertiary alcohol, or it may be any alcohol such as one having a substituent of linear or cyclic alkyl group, alkenyl group, or aryl group.
  • aliphatic primary alcohols such as methanol, ethanol, n-propanol, n-butanol, n-hexanol, n-heptanol, n-octanol, n-decanol, n-dodecanol, stearyl alcohol, 2-ethylhexan-1-ol and neopentyl alcohol
  • aromatic primary alcohols such as benzyl alcohol
  • aliphatic secondary alcohols such as isopropyl alcohol, s-butyl alcohol, 1-methylhexan-1-ol
  • alicyclic secondary alcohols such as cyclohexanol and 2-adamanthirol
  • tertiary alcohols such as t-butyl alcohol, 1-adamanthirol, phenol, o-cresol, m-cresol, p-cresol, 3,5-dimethylphenol, ⁇ -n
  • these alcohols can be suitably selected.
  • Ester condensate can be produced chemoselectively, for instance, condensation reaction with bulky carboxylic acid and a primary hydroxyl group is caused selectively with the multiple alcohols having a primary hydroxyl group and a secondary hydroxyl group. Moreover, the further the distance between the primary hydroxyl group and the secondary hydroxyl group extends, the more selectively the condensation reaction with the primary hydroxyl group can be caused.
  • estrerification reaction of the method for preparing an ester condensate of the present invention equimolar amounts of carboxylic acid and alcohol may be used.
  • carboxylic acid and alcohol a monovalent carboxylic acid and a monohydric alcohol are used respectively as the carboxylic acid and the alcohol, an ester monomer is obtained, and when a polycarboxylic acid such as ⁇ , ⁇ -aliphatic dicarboxylic acid and a multiple alcohol such as ⁇ , ⁇ -aliphatic diol are used, a polyester can be synthesized.
  • polyester can be synthesized also when ⁇ -hydroxycarboxylic acid containing a hydroxyl group at one of the terminals and a carboxy group at another terminal respectively in a molecule, is used as the carboxylic acid and the alcohol.
  • ⁇ -hydroxycarboxylic acid ⁇ -hydroxyundecanoic acid, hydroxydodecane acid, p-hydroxybenzoic acid, m-hydroxybenzoic acid, 6-hydroxynaphthalene-2-carboxylic acid, 4- ⁇ -hydroxyphenoxy) benzoic acid, 3- ⁇ -hydroxyphenoxy)benzoic acid, 4-(m-hydroxyphenoxy)benzoic acid, and 3-(m-hydroxyphenoxy) benzoic acid.
  • any zirconium(IV) compound will suffice as long as it is a compound having tetravalent zirconium in the molecule, for instance, it may be a compound represented by a general formula (3): ZrX 4 Y e (3), (wherein X represents a halogen atom, Y represents tetrahydrofuran, and e represents 0 or 2).
  • halides such as zirconium fluoride (ZrF 4 ), zirconium chloride (ZrCl 4 ), zirconium bromide (ZrBr 4 ), and zirconium iodide (ZrI 4 ); and ether complexes wherein tetrahydrofuran is coordinated to these zirconium(IV) halides, in particular, ZrF 4 .(THF) 2 , ZrCl 4 .(THF) 2 , ZrBr 4 .(THF) 2 , ZrI 4 .(THF) 2 , and the like, can be listed.
  • ether complexes or amid complexes having high stability to water, wherein ether ligands or amide ligands are coordinated to zirconium(IV) halides and the like.
  • the amide compounds such as N,N-dimethylformamide, N,N-dimethylacetamide, N,N-diacetamide, and N-aceto-2-ketooxazolidine, which are represented by the structural formula: R 3 CONR 4 R 5 , (wherein R 3 represents a hydrogen atom, an alkyl group, an acyl group or an alkoxyl group, and R 4 and R 5 represent hydrogen atoms, alkyl groups, acyl groups, and alkoxyl carbonic groups independently, and R 3 to R 5 may be bond together to form a circle).
  • R 3 CONR 4 R 5 (wherein R 3 represents a hydrogen atom, an alkyl group, an acyl group or an alkoxyl group, and R 4 and R 5 represent hydrogen atoms, alkyl groups, acyl groups, and alkoxyl carbonic groups independently, and R 3 to R 5 may be bond together to form a circle).
  • zirconium(IV) compounds used in the method for preparing an ester condensate of the present invention sulfates such as zirconium sulfate (Zr(SO) 4 ), and alkyl zirconium(IV) compounds such as dicyclopentadienyl zirconium(IV) dichloride, can be exemplified.
  • a zirconium oxide dihalide hydrate represented by the structural formula: Zr(IV)X 2 O.nH 2 O can be exemplified as a zirconium(IV) compound catalysts, which can be repeatedly used.
  • the zirconium oxide dihalide hydrate is obtained as follows: esterification reaction is carried out by using zirconium(IV) halide salts and the like as a catalyst, and after the reaction is finished, the catalyst is extracted with hydrochloric acid aqueous solution, and condensation operation is stopped when a solid is deposited in the process of condensation of the extract of the hydrochloric acid aqueous solution.
  • X represents a halogen atom and n represents an integer, wherein n is 6 or more, preferably n is 8.
  • zirconium oxide dihalide hydrate zirconium oxide difluoride hydrate, zirconium oxide dichloride hydrate, zirconium oxide dibromide hydrate, zirconium oxide diiodide hydrate, and the like can be exemplified.
  • acyl group represented by R 1 acetyl group, propionyl group, butyryl group, isobutyryl group, valeryl group, isovaleryl group, hexanoyl group, benzoyl group and the like can be specifically exemplified.
  • zirconium(IV) compound represented by the general formula (1) followings are included in the specific examples: zirconium(IV) tetraacetate, zirconium(IV) triacetatehydroxide, zirconium(IV) diacetate dihydroxide, zirconium(IV) acetate trihydroxide, zirconium(IV) tetrahydroxide, zirconium(IV) tetrapropionate, zirconium(IV) tripropionate hydroxide, zirconium(IV) dipropionate dihydroxide, zirconium(IV) propionate trihydroxide, zirconium(IV) tetraisopropionate, zirconium(IV) triisopropionate hydroxide, zirconium(IV) diisopropionate dihydroxide, zirconium(IV) propionate trihydroxide, zirconium(IV) tetrabutyrate, zirconium(IV) tributyrate hydro
  • zirconium(IV) compound represented by the general formula (1) having the R 1 zirconium(IV) alkoxide such as zirconium(IV) methoxide, zirconium(IV) ethoxide, zirconium(IV) propoxide, zirconium(IV) isopropoxide, zirconium(IV) butoxide, zirconium(IV) isobutoxide, zirconium(IV) t-butoxide, and zirconium(IV) pentyloxide, can be specifically exemplified.
  • hafnium (IV) compound contained in the catalyst used in the method for preparing an ester condensate of the present invention may be any compound as long as it has tetravalent hafnium in the molecule, for instance, it may be a compound represented by a general formula (4): HfX 4 Y f (4), (wherein X represents a halogen atom, Y represents tetrahydrofuran, and f represents 0 or 2).
  • halides such as hafnium fluoride (HfF 4 ), hafnium chloride (HfCl 4 ), hafnium bromide (HfBr 4 ), and hafnium iodide (HfI 4 ); and ether complexes wherein tetrahydrofurans are coordinated to these hafnium(IV) halides.
  • HfF 4 .(THF) 2 , HfCl 4 .(THF) 2 , HfBr 4 .(THF) 2 , HfI 4 (THF) 2 , and the like can be exemplified.
  • ether complex or an amid complex having high stability to water, wherein ether ligands or amide ligands are coordinated to hafnium(IV) halides.
  • amide ligands and the ether ligands the same ligands as those of the zirconium (IV) compound stated above, can be listed.
  • hafnium(IV) compounds used in the method for preparing an ester condensate of the present invention sulfates such as hafnium sulfate (Hf(SO) 4 ), and alkyl hafnium(IV) compounds such as dicyclopentadienyl hafnium(IV) dichloride, can be exemplified.
  • a hafnium oxide dihalide hydrate represented by the structural formula: HfX 2 O.nH 2 O can be exemplified as a hafnium(IV) compound catalysts, which can be repeatedly used.
  • the hafnium oxide dihalide hydrate is obtained as follows: esterification reaction is carried out by using a hafnium(IV)halide salts and the like as a catalyst, and after the reaction is finished, the catalyst is extracted with hydrochloric acid aqueous solution, and condensation operation is stopped when a solid is deposited in the process of condensation of the extract of the hydrochloric acid aqueous solution.
  • X represents a halogen atom and n represents an integer, where n is 6 or more, preferably n is 8.
  • hafnium oxide dihalide hydrate hafnium oxide difluoride hydrate, hafnium oxide dichloride hydrate, hafnium oxide dibromide hydrate, hafnium oxide diiodie hydrate, and the like can be exemplified.
  • acyl group represented by R 2 acetyl group, propionyl group, butyryl group, isobutyryl group, valeryl group, isovaleryl group, hexanoyl group, benzoyl group and the like can be specifically exemplified.
  • hafnium(IV) compound represented by the general formula (2) following can be exemplified: hafnium(IV) tetraacetate, hafnium(IV) triacetate hydroxide, hafnium(IV) diacetate dihydroxide, hafnium(IV) acetate trihydroxide, hafnium(IV) tetrahydroxide, hafnium(IV) tetrapropionate, hafnium(IV) tripropionate hydroxide, hafnium(IV) dipropionate dihydroxide, hafnium(IV) propionate trihydroxide, hafnium(IV) tetraisopropionate, hafnium(IV) triisopropionate hydroxide, hafnium(IV) diisopropionate dihydroxide, hafnium(IV) propionate trihydroxide, hafnium(IV) tetrabutyrate, hafnium(IV) tributyrate hydro
  • hafnium(IV) compound represented by the general formula (2) having the R 2 hafnium(IV) alkoxide such as hafnium(IV) methoxide, hafnium(IV) ethoxide, hafnium(IV) propoxide, hafnium(IV) isopropoxide, hafnium(IV) butoxide, hafnium(IV) isobutoxide, hafnium(IV) t-butoxide, hafnium(IV) pentyloxide and the like, can be exemplified.
  • zirconium(IV) compounds or hafnium(IV) compounds can be mixed for using as a catalyst, and its usage is not especially limited to.
  • ester is synthesized from carboxylic acid and alcohol, in the case where these compounds are used separately or in combination, 0.1 to 10 mol % or preferably 0.1 to 5 mol % as the total amount of the catalyst can be exemplified.
  • Iron(III) compounds and gallium(III) compounds used with the zirconium(IV) compounds/hafnium(IV) compounds contained in the catalyst used in the method for preparing an ester condensate of the present invention are not especially limited to, but iron(III)alkoxide and gallium(III) alkoxide can be specifically exemplified.
  • alkoxide As for the alkoxide, followings can be exemplified: iron(III) methoxide, iron(III) ethoxide, iron(III) propoxide, iron(III) isopropoxide, iron(III) butoxide, iron(III) isobutoxide, iron(III) t-butoxide, iron(III) pentyloxide, gallium(III) methoxide, gallium(III) ethoxide, gallium(III) propoxide, gallium(III) isopropoxide, gallium(III) butoxide, gallium(III) isobutoxide and the like, gallium(III) t-butoxide, gallium(III) pentyloxide and the like.
  • iron(III) methoxide, iron(III) ethoxide, iron(III) propoxide, iron(III) isopropoxide and the like can be listed as preferably specific examples, since they can prevent environmental destruction and they are available at low cost.
  • One or more of these iron(III) compounds or gallium(III) compounds can be suitably selected and used in combination.
  • These iron(III) compounds or gallium(III) compounds may be mixed into zirconium(IV) compounds and/or hafnium(IV) compounds prior to use as a composite metal salt catalyst, or they can be respectively added to the reaction system to use.
  • iron(III) compounds and gallium(III) compounds can be used in the range of molar ratio of the above zirconium compound(IV) and/or hafnium(IV) compound to iron(III) compound and/or gallium(III) compound which is between 1 to 0.05 and 1 to 1, preferably between 1 to 0.1 and 1 to 1. Meanwhile, when two or more of them are used in combination, the above molar ratio is determined based on its total amount.
  • the solvent used in the method for preparing an ester condensate of the present invention is not especially limited to, and it can be exemplified by a polar solvent, a mixed solvent of a polar solvent and a nonpolar solvent, and a nonpolar solvent.
  • a nonpolar solvent is preferable in light of easiness of removing water outside of the reaction system, which is generated from esterification reaction.
  • the method for removing the water it can be exemplified by the method using known dehydrating agents such as calcium hydride or molecular sieves but the methods are not limited to these examples.
  • dehydrating agents such as calcium hydride or molecular sieves
  • the methods are not limited to these examples.
  • nonpolar solvents toluene, xylene, mesitylene, pentamethylbenzene, m-terphenyl, benzene, ethylbenzene, 1,3,5-triisopropyl benzene, o-dichlorobenzene, 1,2,4-trichlorobenzene, naphthalene, and 1,2,3,4-tetrahydronaphthalene (tetralin).
  • ethers such as anisole, THF, 1,4-dioxane and the like: and others such as N-methyl-2-pyrrolidinone (N-methyl-2-pyrrolidone), N-butyl-2-pyrrolidinone (N-butyl-2-pyrrolidone), N-ethyl-2-pyrrolidone, 1,3,dimethyl-2-pyrrolidone, cresol, N,N-dimethylformamide, dimethyl acetamide, hexamethyl phosphoramide, dimethyl sulfoxide, diphenyl sulfone, nitrobenzene, benzonitrile, 1,3-dimethyl-2-imidazolidinone, ⁇ -butyrolactone, phenol and the like.
  • volatile alcohol such as methanol and the like
  • the alcohol has an action also as a solvent, thus it is not necessary to use another solvent separately.
  • the estrification reaction in the method for preparing an ester condensate of the present invention it is preferable to perform the reaction in a dried inactivate gas atmosphere, for example in an argon or a nitrogen atmosphere.
  • the argon atmosphere can be formed, for example by the method for flowing argon, and by performing the reaction in the argon atmosphere, it is possible to achieve dehydration and deoxygenated atmosphere at the same time.
  • the condensation reaction of monovalent carboxylic acid with monohydric alcohol, and a polycondensation reaction of aliphatic polycarboxylic acid with aliphatic multiple alcohol it is preferable to perform the reaction under heating reflux between 1000 and 200° C., particularly between 120° and 160° C. for 1 to 24 hours.
  • esterification reaction After esterification reaction is finished, following are processed in order to reuse the used catalyst. Ionic liquids are added to the reaction system, the above composite salt catalyst of zirconium(IV) compound and/or hafnium(IV) compound and iron(III) compound and/or gallium(III) compound is extracted in an ionic liquid layer or a layer of hydrochloric acid solution by using the ionic liquid or the hydrochloric acid solution, and thereby the objective ester condensate is obtained from the organic layer.
  • the ester condensate can be purified by the common method such as distillation or silica gel chromatography, as appropriate.
  • the ionic liquid is a salt having a property that it changes to liquid even at or around room temperature, whose polarity is high enough to melt metal salt well, so it can be preferably used in extraction of the catalyst used in the method for preparing an ester condensate of the present invention.
  • the ionic liquid from which the catalyst is extracted can be used as the catalyst solution for the above esterification reaction as it is without condensation after being washed with diethylether as appropriate.
  • the activity of the catalyst solution is remained after the esterification reaction even it is reused, so it is possible to reuse the catalyst solution.
  • Hydrochloric acid solution can be exemplified as a solvent for using in extraction of the above composite salt catalyst, however, an ionic liquid is preferable in light of environmental protection.
  • any ionic liquid may be used for the ionic liquid for use in the method for preparing an ester condensate of the present invention
  • preferable liquids are exemplified by 1-butyl-3-methylimidazolium trifluoromethanesulfonimide, 1-ethyl-3-methylimidazolium trifluoromethanesulfonate, and N-alkylpyridinium trifluoromethane sulfonate imide, where N-butylpyridinium trifluoromethane sulfonate imide is particularly preferable.
  • the usage of the ionic liquid it is preferable when it is in the range between 0.5 and 2.0 ml to 0.05 mmol of the total usage of the above catalyst, more preferably, it is in the range between 1.0 and 1.5 ml.
  • a low-polar organic solvent such as toluene or heptane is preferably used.
  • a composite metal salt catalyst comprising 3 mol % of zirconium(IV) isoproxide (Zr(Oi-Pr) 4 ), 3 mol % of hafnium(IV) isoproxide (Hf(Oi-Pr) 4 ), and 3 mol % of titanium(IV) isoproxide(Ti(Oi-Pr) 4 ) were used for 4 mol % of iron(III) isopropoxide(Fe(Oi-Pr) 3 ), and a reaction was carried out in the same manner as Example 1 to investigate the change with time of the ester condensation reaction.
  • the ester conversion is shown in Table 3. Time (h) Zr(Oi-Pr) 4 Hf(Oi-Pr) 4 Ti(Oi-Pr) 4 4 60 54 28 8 84 84 42 20 93 92 82
  • Example 2 After the reaction of Example 2, the aqueous layer from which zirconium(IV) and iron(III) were extracted, was used as it was to perform ester condensation reaction.
  • the substrates shown in Table 4 and octane or toluene as a solvent were added to the aqueous layer containing zirconium(IV) and iron(III), and the mixture was heated to reflux at 120° C. or 140° C. for 6 hours to perform reaction. This operation was repeated.
  • the yield of ester is shown in Table 4.
  • zirconium(IV) and iron(III) can be extracted almost completely, by using N-butylpyridinium trifluoromethanesulfonimide, and N-butylpyridinium trifluoromethanesulfonimide is more useful than 1-butyl-3-methylimidazolium trifluoromethanesulfonimide (test 4).
  • reaction solution was cooled to room temperature, hexan (8 ml)/ether (2 ml) was added thereto, the solution was stirred for 30 min and left still for another 30 min, and the organic layer was separated therefrom. Extraction with hexane/ether was repeated until there was no starting material and product remaining in the ionic liquid layer (confirmed by TLC). On the other hand, the remained ionic liquid layer per se was used for the following reaction.
  • test 4 100 mmol of carboxylic acid and 100 mmol of alcohol were used, 0.1 mol % of zirconium(IV) isoproxide (Zr(Oi-Pr) 4 ) and 0.1 mol % of iron(III) isopropoxide (Fe(Oi-Pr) 3 ) were used, 10 ml of the solvent was used, and 2 ml of N-butylpyridinium trifluoromethane sulfonate imide as used. The result is shown in Table 6.
  • zirconium(IV)-iron(III) catalyst could be recycled repeatedly as a solution of N-butylpyridinium trifluoromethane sulfonate imide without being isolated (tests 1 and 3 to 5).
  • zirconium(IV)-iron(III) catalyst (1 mol %) could be reused 15 times or more in esterification reaction of 4-phenylbutyric acid and benzyl alcohol in a biphasic solvent consisting of hepetane and N-butylpyridinium trifluoromethane sulfonate imide, without losing its activity at all.
  • ium(IV)-gallium(III) catalyst could also be reused as a on of N-butylpyridinium trifluoromethane sulfonate imide (test 2).
  • the method for preparing an ester condensate of the present invention can significantly improve the catalytic activity beyond expectation, in esterification reaction of equimolar amounts of carboxylic acid and alcohol, by bringing an iron(III) compound and/or a gallium(III) compound to existence in a zirconium(IV) compound and/or a hafnium (IV) compound catalysts, and it can prevent generation of by-products, and it can prepare an ester condensate efficiently.
  • the catalyst exhibiting an excellent catalytic efficiency, can be used repeatedly without reducing the catalytic efficiency; it is thus reusable. Accordingly the method of the present invention is preferable in view of green chemistry.

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US20080289248A1 (en) * 2007-05-23 2008-11-27 Southern Illinois University Carbondale Immobilized esterification catalysts for producing fatty acid alkyl esters
WO2009084862A3 (en) * 2007-12-27 2009-10-01 Lg Chem, Ltd. Catalyst composition including zirconium compounds for esterfication reaction and method for preparing ester compounds
US20100130763A1 (en) * 2006-12-06 2010-05-27 Southern Illinois University Carbondale Processes for the production of fatty acid alkyl esters
US20100280265A1 (en) * 2008-01-07 2010-11-04 Dai-Seung Choi Catalyst composition including zirconium compounds for esterfication reaction and method for preparing ester compounds

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JP7372101B2 (ja) * 2019-09-27 2023-10-31 上野製薬株式会社 ビス（４－ヒドロキシ安息香酸）１，４－シクロヘキサンジイルビスメチレンの製造方法

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US20070142676A1 (en) * 2005-12-20 2007-06-21 Chevron U.S.A. Inc. Ionic liquid catalyst having enhanced activity
US7666811B2 (en) * 2005-12-20 2010-02-23 Chevron U.S.A. Inc. Ionic liquid catalyst having enhanced activity
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US20080289248A1 (en) * 2007-05-23 2008-11-27 Southern Illinois University Carbondale Immobilized esterification catalysts for producing fatty acid alkyl esters
WO2009084862A3 (en) * 2007-12-27 2009-10-01 Lg Chem, Ltd. Catalyst composition including zirconium compounds for esterfication reaction and method for preparing ester compounds
US20100274039A1 (en) * 2007-12-27 2010-10-28 Dai-Seung Choi Catalyst composition including zirconium compounds for esterfication reaction and method for preparing ester compounds
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US8563764B2 (en) 2008-01-07 2013-10-22 Lg Chem, Ltd. Catalyst composition including zirconium compounds for esterfication reaction and method for preparing ester compounds

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