EP1324971A2 - Darstellung von zimtsäureestern - Google Patents
Darstellung von zimtsäureesternInfo
- Publication number
- EP1324971A2 EP1324971A2 EP01980278A EP01980278A EP1324971A2 EP 1324971 A2 EP1324971 A2 EP 1324971A2 EP 01980278 A EP01980278 A EP 01980278A EP 01980278 A EP01980278 A EP 01980278A EP 1324971 A2 EP1324971 A2 EP 1324971A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- reaction
- acid esters
- cinnamic acid
- acid ester
- basic
- 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.)
- Withdrawn
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C67/00—Preparation of carboxylic acid esters
- C07C67/30—Preparation of carboxylic acid esters by modifying the acid moiety of the ester, such modification not being an introduction of an ester group
- C07C67/333—Preparation of carboxylic acid esters by modifying the acid moiety of the ester, such modification not being an introduction of an ester group by isomerisation; by change of size of the carbon skeleton
- C07C67/343—Preparation of carboxylic acid esters by modifying the acid moiety of the ester, such modification not being an introduction of an ester group by isomerisation; by change of size of the carbon skeleton by increase in the number of carbon atoms
Definitions
- the invention relates to a new process for the synthesis of cinnamic acid esters or substituted cinnamic acid esters by condensation of carboxylic acid esters with
- Cinnamic acid esters and substituted cinnamic acid esters find e.g. Use as light protection filter in cosmetic applications and in plastics.
- 2-Efhylhexyl-4-methoxycinnamic acid ester is a light protection filter for the wavelength range of
- UV-B Light of 280-315 nm (UV-B), which u. a. under the names NeoHeliopan® AV and
- OMC is known (Ullmanns Encyclopedia of Industrial Chemistry 6 th Edition,
- the aim of the present invention is a process for the synthesis of substituted cinnamic acid esters in which benzaldehyde or substituted benzaldehydes are linked with acetic acid esters in a condensation reaction in a reaction step using suitable catalysts.
- R, R and R are the same or different and represent hydrogen, alkoxy or alkyl and
- R 4 means alkyl
- R 1 , R 2 , R 3 have the meaning given above,
- the cinnamic acid esters can be prepared in one step without exposure to salt by the process according to the invention.
- Alkyl is a straight-chain or branched hydrocarbon radical having 1 to 16, preferably 1-10 carbon atoms, such as, for example, ethyl, methyl, propyl, isopropyl, butyl, pentyl, hexyl, heptyl, octyl, 2-ethylhexyl, nonyl and decyl.
- Alkoxy is a straight-chain or branched hydrocarbon radical which is bonded via oxygen and has 1 to 6, preferably 1 to 3, carbon atoms, such as, for example, methoxy, ethoxy, propoxy, iso propoxy, butoxy, iso butoxy, pentoxy, iso pentoxy, hexoxy or iso hexoxy.
- benzaldehydes are:
- carboxylic acid esters examples are:
- Hexylacetic acid esters Hexylacetic acid esters, heptylacetic acid esters, octylacetic acid esters, 2-ethylhexyl acetic acid esters, nonylacetic acid esters, decylacetic acid esters.
- Preferred benzaldehyde (II) is 4-methoxybenzaldehyde, preferred carboxylic acid ester is 2-ethylhexylacetic acid ester.
- the molar ratio of benzaldehyde to carboxylic acid ester is generally in the range from 0.01 to 10, preferably in the range from 0.1 to 1 and particularly preferably in the range from 0.2 to 0.5.
- the process according to the invention can be carried out in solvent or in bulk.
- Solvents for the process according to the invention are, for example, toluene, xylene, chlorobenzene, dichlorobenzene.
- the water formed during the reaction is preferably removed from the reaction mixture, particularly preferably by distillation.
- the solvents or the carboxylic acid ester (III) used can be used as entrainer for the water of reaction in the distillation.
- the water can be separated off in a separator, it being possible to place the separator directly on the reactor or to use a separation column between the reactor and separator. The water is discharged when the reaction solution or the solvent refluxes.
- Metal carbonates and oxides, mixed oxides, mixtures of metal carbonates, mixtures of metal oxides and mixtures of metal carbonates and metal oxides are used as basic solids for the process according to the invention.
- Alkali and alkaline earth carbonates and oxides are preferred, and here the carbonates and oxides of sodium, cesium, potassium, magnesium and calcium.
- Aluminum oxide, zinc oxide and zirconium oxide may also be mentioned as basic solids.
- Potassium and cesium carbonate are particularly preferred.
- the basic solids can also be doped with sodium oxide, potassium fluoride, cerium oxide, ammonium fluoride, potassium carbonate and cesium carbonate.
- the doping is preferably added in an amount of 0.1 to 50% by weight, particularly preferably in an amount of 5 to 50% by weight, based on the total amount of the basic solid.
- the solids can be used in pure form, supported or as a mixture, preference is given to mixtures of potassium and cesium carbonate, particularly preferred are mixtures of cesium and potassium carbonate in which both carbonates are used in equal parts by mass.
- the catalyst concentrations can be between 0.1 and 50% (w / w), preferred catalyst concentrations are between 5 and 50% (w / w).
- the catalyst can be pretreated thermally or mechanically before the reaction and used in powder form or as a shaped body.
- Basic insoluble solids, especially inorganic, basic, insoluble solids are known per se as catalysts for condensation reactions of the aldol type (Chem. Rev., 1995, 95, 537-558, Catal.
- Inorganic solids especially oxides, with halogen-containing compounds, modified oxides, carbonates, mixtures of carbonates, mixtures of carbonates and oxides, characterized in that they are substances with basic properties, are suitable catalysts for the synthesis of cinnamic acid esters or substituted ones Cinnamic acid esters from benzaldehyde or substituted benzaldehydes and acetic acid esters.
- inorganic solids are considered to have a significantly lower basicity than e.g. B. Alkaline alcoholates, which are used in condensation reactions of the type described.
- the high activity and selectivity achieved with potassium carbonate and cesium carbonate in the reaction mentioned was particularly surprising.
- the reaction pressure can be in the range from 0.1 to 10 bar, preferably in the range from 0.5 to 2 bar.
- the reaction temperature is generally in the range from 100 ° C. to 300 ° C., preferably 150 ° C. to 250 ° C.
- the reaction time can be between 0.5 and 48 h; preferred reaction times are between 0.5 and 5 hours.
- reaction mixture must be mixed thoroughly during the reaction, which can be done by the boiling reaction solution alone and by the additional use of a stirring tool.
- the reaction product is isolated after removal of the catalyst by distillation under reduced pressure.
- the catalyst can be separated off by filtration and, if the catalyst is water-soluble, by adding water, dissolving the catalyst solid and then separating the phases.
- the method according to the invention can be carried out, for example, as follows:
- 5-20% (w / w) catalyst which is either used without further pretreatment or has been baked or ground at elevated temperature before the reaction, is taken up, for example, in 2-ethylhexylacetic acid ester and the reaction mixture is heated to reflux temperature, then 4-methoxybenzaldehyde is metered in, the molar ratio of aldehyde to carboxylic acid ester being between 0.1 and 1.
- the progress of the reaction is determined by the water of reaction formed as well as by sampling and gas chromatographic analysis of the samples. After the end of the reaction, the catalyst is filtered off and the filtrate is distilled under reduced pressure.
- cinnamic acid esters or substituted cinnamic acid esters can be prepared by condensing carboxylic acid esters with benzaldehyde or substituted benzaldehydes catalyzed by a solid with basic properties with continuous removal of the water of reaction formed.
- 2-Ethylhexyl-4-methoxycinnamic acid ester can preferably be prepared by the process according to the invention.
- the process according to the invention for the synthesis of cinnamic acid esters or substituted cinnamic acid esters is simple to use, can be carried out with inexpensive and available starting materials, does not require any toxic or ecologically questionable starting compounds, and in addition to the water of reaction formed, has no by-products, which prevents the inevitable generation of waste.
- the process according to the invention provides the target product in one synthesis step and uses a catalyst which can be easily removed from the product.
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10044381A DE10044381A1 (de) | 2000-09-08 | 2000-09-08 | Zimtsäureester |
| DE10044381 | 2000-09-08 | ||
| PCT/EP2001/009844 WO2002020456A2 (de) | 2000-09-08 | 2001-08-27 | Darstellung von zimtsäureestern |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP1324971A2 true EP1324971A2 (de) | 2003-07-09 |
Family
ID=7655465
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP01980278A Withdrawn EP1324971A2 (de) | 2000-09-08 | 2001-08-27 | Darstellung von zimtsäureestern |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US6531625B2 (de) |
| EP (1) | EP1324971A2 (de) |
| AU (1) | AU2002212163A1 (de) |
| DE (1) | DE10044381A1 (de) |
| WO (1) | WO2002020456A2 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7741508B2 (en) * | 2006-03-30 | 2010-06-22 | Council Of Scientific & Industrial Research | Single step green process for the preparation of substituted cinnamic esters with trans-selectivity |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE709227C (de) * | 1936-06-25 | 1941-08-09 | Du Pont | Verfahren zur Herstellung von Kondensationsprodukten mittels Alkali- oder Erdalkalimetallhydriden als Kondensationsmittel |
| DE3101783C2 (de) | 1981-01-21 | 1983-03-03 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., 8000 München | Verfahren zur Herstellung von grobkörnigem 1,3,5-Triaminotrinitrobenzol |
| US4970332A (en) | 1989-03-09 | 1990-11-13 | Mallinckrodt, Inc. | Process for producing 2-ethylhexyl-p-methoxycinnamate |
| DE4039782A1 (de) | 1990-12-13 | 1992-06-17 | Basf Ag | Verfahren zur herstellung von 3-arylacrylsaeuren und ihren derivaten |
| US5527947A (en) * | 1994-12-19 | 1996-06-18 | Isp Van Dyk Inc. | Process for preparation of cinnamate sunscreen agents |
| DE4447068A1 (de) | 1994-12-29 | 1996-07-04 | Hoechst Ag | Verfahren zur Herstellung aromatischer Olefine |
| DE69608304T2 (de) * | 1995-12-11 | 2000-11-30 | Ciba Specialty Chemicals Holding Inc., Basel | Basische katalysatoren für die adolreaktion |
-
2000
- 2000-09-08 DE DE10044381A patent/DE10044381A1/de not_active Withdrawn
-
2001
- 2001-08-27 EP EP01980278A patent/EP1324971A2/de not_active Withdrawn
- 2001-08-27 AU AU2002212163A patent/AU2002212163A1/en not_active Abandoned
- 2001-08-27 WO PCT/EP2001/009844 patent/WO2002020456A2/de not_active Ceased
- 2001-09-05 US US09/947,257 patent/US6531625B2/en not_active Expired - Fee Related
Non-Patent Citations (2)
| Title |
|---|
| E. V. DEHMLOW ET AL.: "Anwendungen der Phasentransfer-Katalyse", JOURNAL OF CHEMICAL RESEARCH ON MINIPRINT., 1981, pages 1178 - 1184, XP008038274 * |
| See also references of WO0220456A3 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2002020456A2 (de) | 2002-03-14 |
| US20020133038A1 (en) | 2002-09-19 |
| DE10044381A1 (de) | 2002-04-04 |
| AU2002212163A1 (en) | 2002-03-22 |
| WO2002020456A3 (de) | 2002-06-27 |
| US6531625B2 (en) | 2003-03-11 |
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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: 20030408 |
|
| AK | Designated contracting states |
Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR |
|
| AX | Request for extension of the european patent |
Extension state: AL LT LV MK RO SI |
|
| RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: SYMRISE GMBH & CO. KG |
|
| RBV | Designated contracting states (corrected) |
Designated state(s): CH DE ES FR GB LI |
|
| 17Q | First examination report despatched |
Effective date: 20041115 |
|
| RTI1 | Title (correction) |
Free format text: PREPARATION OF CINNAMIC ACID ESTERS |
|
| GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
| 18D | Application deemed to be withdrawn |
Effective date: 20051118 |