EP0711851B1 - Verfahren zur Herstellung von p-Hydroxybenzaldehyden - Google Patents
Verfahren zur Herstellung von p-Hydroxybenzaldehyden Download PDFInfo
- Publication number
- EP0711851B1 EP0711851B1 EP95117495A EP95117495A EP0711851B1 EP 0711851 B1 EP0711851 B1 EP 0711851B1 EP 95117495 A EP95117495 A EP 95117495A EP 95117495 A EP95117495 A EP 95117495A EP 0711851 B1 EP0711851 B1 EP 0711851B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tert
- butyl
- mol
- hydroxybenzaldehyde
- phenol
- 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.)
- Expired - Lifetime
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B3/00—Electrolytic production of organic compounds
- C25B3/20—Processes
- C25B3/23—Oxidation
Definitions
- the present invention relates to an improved process for the preparation of p-hydroxybenzaldehydes of the general formula I. in which the aromatic ring can carry 2 to 4 inert substituents X, by electrochemical oxidation of a phenol of the general formula II in the presence of an alkanol R 1 -OH, the radical R 1 being a C 1 -C 6 alkyl radical.
- the aldehydes I serve as intermediates for the production of pharmaceuticals, light and crop protection agents, stabilizers, Antioxidants, colors and fragrances.
- the invention was based, the aldehydes I from the task To make phenols II selectively accessible in higher yields.
- the starting compounds I can carry inert substituents such as alkyl, alkoxy, alkoxycarbonyl, cyano or halogen radicals.
- substituents such as alkyl, alkoxy, alkoxycarbonyl, cyano or halogen radicals.
- those compounds of the general formula III are preferred among the starting compounds in which the radicals R 2 and R 3 are independently of one another for C 1 -C 18 -alkyl radicals such as methyl, ethyl, n-propyl, isopropyl , n-butyl, iso-butyl and tert-butyl, but also for C 1 -C 18 alkoxy radicals such as methoxy or ethoxy.
- the compounds of the formula II or III are commercially available or can be prepared by methods known per se.
- the electrochemical oxidation is carried out in the presence of an alkanol R 1 -OH, the radical R 1 being a C 1 -C 6 alkyl radical.
- Methanol is preferred.
- the electrolyte can contain a solvent which is inert under the electrolysis conditions, such as acetonitrile; however, the electrolysis is preferably carried out without such a solvent.
- concentration of the alkanol in the electrolyte is usually 50 to 98% by weight.
- the electrolyte also contains an organic or inorganic one Base.
- This base must be able to remove the phenol II or III to convert into the corresponding phenol ion.
- amines e.g. tertiary amines, such as triethylamine, but preferably alkali metal hydroxides such as NaOH and KOH and alkali metal alcoholates such as sodium methoxide and ethanolate.
- the bases are in substoichiometric amounts, based on the Phenol II or III used. 0.01 to 0.9 are preferred. particularly preferably 0.25 to 0.7 equivalents of base per equivalent Phenol II or III used.
- auxiliary electrolyte such as weakly basic or neutral Salts are usually not required, so preferably without such auxiliary electrolytes is worked.
- the process according to the invention is generally carried out at current densities of 0.1 to 20 A / dm 2 , preferably at 2 to 8 A / dm 2 .
- the amount of charge is usually 4 to 6 F / mol of starting compound.
- the temperature can be varied within wide limits. she can -20 to 180 ° C, preferred are 50 to 70 ° C. There prevails reduced pressure, normal pressure or positive pressure, but preferred Normal pressure or an overpressure up to 3 bar.
- Precious metals such as platinum or oxides such as chromium and ruthenium oxide and mixed oxides such as Ti / RuO x can be considered as anode materials.
- Graphite and platinum electrodes are preferred.
- the electrolysis can be carried out batchwise or continuously will.
- a partial stream the reaction solution is separated off and worked up, which generally makes up less than 5% by weight of the total current.
- the reaction solution new starting solution added.
- the reaction solution is advantageously worked up by distilling off the alkanol R 1 -OH.
- the residue is worked up hydrolytically, preferably in neutral or acid.
- Mineral acids such as sulfuric acid or organic acids such as acetic acid can be used for acidification. These acids are generally added to the reaction mixture in amounts of 1 to 10% by weight, based on the reaction mixture.
- the product is then either separated off as a solid or, after extraction with an organic solvent such as methyl tert-butyl ether or toluene, obtained by distillation.
- the alkanol R 1 -OH and optionally recovered starting material II or III can be used in further batches.
- the method according to the invention allows selective production the aldehydes I in high yield.
- Electrolyte composition 150 g (0.68 mol, 5% by weight) 2,6-di-tert-butyl-4-methylphenol 61.4 g (0.34 mol, 0.6% by weight) Sodium methylate as a 30% methanolic solution 2789 g Methanol Electrolysis conditions: temperature 58 ° C Current density 4 A / dm 2 Amount of charge 4.7 F / mol
- the production was carried out in analogy to Example 1, but the current density was 8 A / dm 2 .
- Electrolyte composition :
- Electrolyte composition :
- Electrolyte composition 150 g (0.68 mol, 5% by weight) 2,6-di-tert-butyl-4-methylphenol 19.1 g (0.34 mol, 0.6% by weight) Potassium hydroxide 2830 g Methanol
- Electrolyte composition 150 g (1.1 mol, 10% by weight) 2,4,6-trimethylphenol 100 g (0.55 mol, 1% by weight) Sodium methylate as a 30% methanolic solution 2750 g Methanol Electrolysis conditions: temperature 58 ° C Current density 4 A / dm 2 Amount of charge 5 F / mol
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
3-Methyl-5-tert.-Butyl-4-hydroxybenzaldehyd, 3,5-Di-tert.-butyl-4-hydroxybenzaldehyd, 3,5-Di-n-butyl-4-hydroxybenzaldehyd, 3,5-Di-isopropyl-4-hydroxybenzaldehyd, 3,5-Diethyl-4-hydroxybenzaldehyd, 3,5-Dimethyl-4-hydroxybenzaldehyd, 3-tert.-Butyl-5-methyl-4-hydroxybenzaldehyd.
Der Elektrolyt wurde mit 550 l/h umgepumpt.
Die Aufarbeitung erfolgte erfindungsgemäß durch Hydrolyse des Reaktionsgemisches.
Nicht umgesetztes Substrat und Zwischenprodukt wurden durch Extraktion der wäßrigen Mutterlauge mit Methyl-tert.-Butylether (MTBE) nach Filtration des Produktes und Eindampfen der Mutterlauge aus der Umkristallisation des Produktes gewonnen. Die Angaben in Gew.-% beziehen sich auf den Gesamtreaktionsansatz.
Elektrolytzusammensetzung: | |
150 g (0,68 mol, 5 Gew.-%) | 2,6-Di-tert.-butyl-4-methylphenol |
61,4 g (0,34 mol, 0,6 Gew.-%) | Natriummethylat als 30 %ige methanolische Lösung |
2789 g | Methanol |
Elektrolysebedingungen: | |
Temperatur | 58°C |
Stromdichte | 4 A/dm2 |
Ladungsmenge | 4,7 F/mol |
148 g (0,66 mol, 93 %) 3,5-Di-tert.-butyl-4-hydroxybenzaldehyd
143 g (0,61 mol, 90 %) 3,5-Di-tert.-butyl-4-hydroxybenzaldehyd
146 g (0,62 mol, 91 %) 3,5-Di-tert.-butyl-4-hydroxybenzaldehyd
289 g (1,24 mol, 91 %) 3,5-Di-tert.-butyl-3-hydroxybenzaldehyd
258 g (1,1 mol, 81 %) 3,5-Di-tert.-butyl-4-hydroxybenzaldehyd
271 g (1,2 mol, 85 %) 3,5-Di-tert.-butyl-4-hydroxybenzaldehyd
Elektrolytzusammensetzung: | |
150 g (0,68 mol, 5 Gew.-%) | 2,6-Di-tert.-butyl-4-methylphenol |
19,1 g (0,34 mol, 0,6 Gew.-%) | Kaliumhydroxid |
2830 g | Methanol |
119 g (0,51 mol, 75 %) 3,5-Di-tert.-butyl-4-hydroxybenzaldehyd
Elektrolytzusammensetzung: | |
150 g (1,1 mol, 10 Gew.-%) | 2,4,6-Trimethylphenol |
100 g (0,55 mol, 1 Gew.-%) | Natriummethylat als 30 %ige methanolische Lösung |
2750 g | Methanol |
Elektrolysebedingungen: | |
Temperatur | 58°C |
Stromdichte | 4 A/dm2 |
Ladungsmenge | 5 F/mol |
114 g (0,76 mol, 69 %) 3,5-Di-methyl-4-hydroxybenzaldehyd
Claims (7)
- Verfahren zur Herstellung von p-Hydroxybenzaldehyden der allgemeinen Formel I in der der aromatische Ring 2 bis 4 inerte Substituenten X tragen kann, durch elektrochemische Oxidation eines Phenols der allgemeinen Formel II in Gegenwart eines Alkanols R1-OH, wobei der Rest R1 für einen C1-C6-Alkylrest steht, dadurch gekennzeichnet, daß man die Reaktion in Gegenwart von weniger als stöchiometrischen Mengen einer organischen oder anorganischen Base, die ein Phenol der Formel II in das entsprechende Phenolation überführen kann, durchführt, das Reaktionsgemisch hydrolytisch aufarbeitet und den Aldehyd der Formel I isoliert.
- Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß die Reste R2 und R3 für einen tert.-Butylrest stehen.
- Verfahren nach den Ansprüchen 1 bis 3, dadurch gekennzeichnet, daß man die elektrochemische Oxidation in ungeteilten Durchflußzellen durchführt.
- Verfahren nach den Ansprüchen 1 bis 4, dadurch gekennzeichnet, daß man bei 50 bis 70°C elektrolysiert.
- Verfahren nach den Ansprüchen 1 bis 5, dadurch gekennzeichnet, daß man 0,25 bis 0,7 Äquivalente Base pro Äquivalent Phenol der Formel II einsetzt.
- Verfahren nach den Ansprüchen 1 bis 6, dadurch gekennzeichnet, daß man Alkalimetallhydroxide oder Alkalimetallalkoholate als Base einsetzt.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4440466A DE4440466A1 (de) | 1994-11-15 | 1994-11-15 | Verfahren zur Herstellung von p-Hydroxybenzaldehyden |
DE4440466 | 1994-11-15 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0711851A1 EP0711851A1 (de) | 1996-05-15 |
EP0711851B1 true EP0711851B1 (de) | 1998-03-04 |
Family
ID=6533160
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95117495A Expired - Lifetime EP0711851B1 (de) | 1994-11-15 | 1995-11-07 | Verfahren zur Herstellung von p-Hydroxybenzaldehyden |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0711851B1 (de) |
JP (1) | JPH08209372A (de) |
DE (2) | DE4440466A1 (de) |
ES (1) | ES2113150T3 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TW200631931A (en) * | 2005-01-19 | 2006-09-16 | Merisol Rsa Pty Ltd | Method for the production of alkoxy-substituted phenols |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5227739A (en) * | 1975-08-26 | 1977-03-02 | Takasago Corp | Process for preparation of 3-substituted or non-substituted-4-hydroxyb enzaldehyde by electrolytic oxidation |
JPS572881A (en) * | 1980-06-04 | 1982-01-08 | Otsuka Chem Co Ltd | Manufacture of 3,5-dialkoxy-4-hydroxybenzaldehyde |
-
1994
- 1994-11-15 DE DE4440466A patent/DE4440466A1/de not_active Withdrawn
-
1995
- 1995-11-07 DE DE59501538T patent/DE59501538D1/de not_active Expired - Lifetime
- 1995-11-07 ES ES95117495T patent/ES2113150T3/es not_active Expired - Lifetime
- 1995-11-07 EP EP95117495A patent/EP0711851B1/de not_active Expired - Lifetime
- 1995-11-13 JP JP7294256A patent/JPH08209372A/ja not_active Withdrawn
Also Published As
Publication number | Publication date |
---|---|
ES2113150T3 (es) | 1998-04-16 |
JPH08209372A (ja) | 1996-08-13 |
DE59501538D1 (de) | 1998-04-09 |
DE4440466A1 (de) | 1996-05-23 |
EP0711851A1 (de) | 1996-05-15 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP0011712A2 (de) | Verfahren zur Herstellung von in 4-Stellung substituierten Benzaldehyddialkylacetalen | |
EP0012240A2 (de) | Verfahren zur Herstellung von gegebenenfalls substituierten Benzaldehyd-dialkylacetalen | |
EP2616424B1 (de) | Verfahren zur herstellung von 2-methyl-3-(4-tert-butylphenyl)-propanal mit hoher para-isomerenreinheit | |
EP1197483A2 (de) | Verfahren zur katalytischen Reduktion von Alkinverbindungen | |
EP0711851B1 (de) | Verfahren zur Herstellung von p-Hydroxybenzaldehyden | |
EP2411564B1 (de) | Elektrochemisches verfahern zur herstellung von 3-tert.-butylbenzaldehyd-dimethylacetal | |
EP0638665B1 (de) | Verfahren zur Herstellung von Bezaldehyddialkylacetalen | |
EP0129795A2 (de) | Verfahren zur Herstellung von Benzaldehyddialkylacetalen | |
EP0012942A2 (de) | Elektrolytisches Verfahren zur Herstellung von Benzaldehyden | |
EP0165521A1 (de) | Verfahren zur Herstellung eines Gemisches aus einem gegebenenfalls substituierten Zimtsäureester und einem gegebenenfalls substituierten Beta-Alkoxy-Beta-phenyl-propionsäureester sowie Verfahren zur Herstellung von gegebenenfalls substituierter Zimtsäure | |
EP0502372B1 (de) | 4-tert-Alkyl-2-Methylbenzaldehyddialkylacetale | |
EP0347690B1 (de) | Verfahren zur Herstellung von Benzolderivaten und neue Benzolderivate | |
EP0009697B1 (de) | Verfahren zur Herstellung von N-(Alpha-Methoxy-alkyl)-urethanen und neue N-(Alpha-methoxy-alkyl)-urethane | |
EP0179377B1 (de) | Verfahren zur Herstellung von 1-Alkoxyisochromanen und neue 1-Alkoxy-alkylisochromane | |
EP0513577B1 (de) | Verfahren zur Herstellung von 1-Alkoxyisochromanen | |
EP0554564A1 (de) | Verfahren zur Herstellung von Benzaldehydacetalen | |
EP0053261B1 (de) | Verfahren zur Herstellung eines Gemisches von Ketalen des Trimethyl-p-benzochinons | |
DE3152459C2 (de) | ||
EP0110432A1 (de) | Verfahren zur Herstellung von Fluoren-9-carbonsäure | |
EP0025883A1 (de) | Elektrochemisches Verfahren zur Herstellung von 4-tert.-Butoxybenzaldehyddialkylacetalen, ihre Verwendung und 4-tert.-Butoxybenzaldehyddimethylacetal | |
EP0040357B1 (de) | Verfahren zur Herstellung von v-Triazolyl-(2)-phenolen | |
DE60010516T2 (de) | Verfahren zur herstellung von tetrahydropyranyloxyaminen | |
WO2006087321A1 (de) | Selektive spaltung von substituierten bisbenzylamiden und -aminen | |
EP0339521A1 (de) | Verfahren zur Herstellung von Tetralinderivaten und neue Tetralinderivate | |
EP0525351A2 (de) | 2-Aryl-2,2-dialkoxyessigsäurealkylester, Verfahren zu ihrer Herstellung und ihre Verwendung zur Herstellung von Arylglyoxylsäureestern |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 19960223 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): BE CH DE ES FR GB LI NL |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
17Q | First examination report despatched |
Effective date: 19970617 |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): BE CH DE ES FR GB LI NL |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: EP |
|
GBT | Gb: translation of ep patent filed (gb section 77(6)(a)/1977) |
Effective date: 19980312 |
|
REF | Corresponds to: |
Ref document number: 59501538 Country of ref document: DE Date of ref document: 19980409 |
|
REG | Reference to a national code |
Ref country code: ES Ref legal event code: FG2A Ref document number: 2113150 Country of ref document: ES Kind code of ref document: T3 |
|
ET | Fr: translation filed | ||
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed | ||
REG | Reference to a national code |
Ref country code: GB Ref legal event code: IF02 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 20021017 Year of fee payment: 8 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: NL Payment date: 20021021 Year of fee payment: 8 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: CH Payment date: 20021024 Year of fee payment: 8 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20021101 Year of fee payment: 8 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: ES Payment date: 20021106 Year of fee payment: 8 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: BE Payment date: 20021128 Year of fee payment: 8 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20021213 Year of fee payment: 8 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20031107 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: ES Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20031108 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LI Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20031130 Ref country code: CH Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20031130 Ref country code: BE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20031130 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF THE APPLICANT RENOUNCES Effective date: 20031217 |
|
BERE | Be: lapsed |
Owner name: *BASF A.G. Effective date: 20031130 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20040601 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20031107 |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20040730 |
|
NLV4 | Nl: lapsed or anulled due to non-payment of the annual fee |
Effective date: 20040601 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST |
|
REG | Reference to a national code |
Ref country code: ES Ref legal event code: FD2A Effective date: 20031108 |