WO1999006344A1 - Verfahren zur herstellung von acetalen des 3-methyl-2-butenals - Google Patents
Verfahren zur herstellung von acetalen des 3-methyl-2-butenals Download PDFInfo
- Publication number
- WO1999006344A1 WO1999006344A1 PCT/EP1998/004479 EP9804479W WO9906344A1 WO 1999006344 A1 WO1999006344 A1 WO 1999006344A1 EP 9804479 W EP9804479 W EP 9804479W WO 9906344 A1 WO9906344 A1 WO 9906344A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- formula
- methyl
- butenal
- alkyl
- iii
- 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.)
- Ceased
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C41/00—Preparation of ethers; Preparation of compounds having groups, groups or groups
- C07C41/48—Preparation of compounds having groups
- C07C41/50—Preparation of compounds having groups by reactions producing groups
- C07C41/56—Preparation of compounds having groups by reactions producing groups by condensation of aldehydes, paraformaldehyde, or ketones
Definitions
- the present invention relates to a process for the preparation of acetals of the formula I.
- R independently of one another represent a Ci to C o-alkyl or C - to C 2 o-alkenyl radical or
- the two radicals R together form the members of a 5 to 7-membered cyclic acetal, which may be C 1 -C 1 -alkyl-substituted,
- m is a number from 2 to 4
- a methylene group in the alcohol Ilb may be substituted by a C 1 -C 8 -alkyl group.
- N- (Ci to C R alkyl) amidosulfonic acids and N, N-D ⁇ (C ⁇ to Cs alkyl) amidosulfonic acids are briefly called “alkyl amidosulfonic acids” in the following text.
- the heterogeneous reaction mixture heats up to 10 ° C. as a result of the exothermic reaction.
- the mixture is then allowed to warm to 21 ° C. for 45 minutes and stirred at this temperature for a further 15 minutes.
- the catalyst is then filtered off and washed with ethanol.
- Potassium carbonate is added to the filtrate and the mixture is stirred at room temperature for one hour. Then the potassium carbonate is also filtered off and washed with ethanol.
- the distillation gives 3-methyl-2-butenal dimethyl acetal with a yield of 85%.
- a disadvantage of this method is that it requires a sophisticated temperature control and the alternate Kuhlungs- and Erwarmungssch ⁇ tte increased energy ⁇ require consumption and an expensive equipment or facilities.
- the object of the present invention was therefore to provide a process which does not have the disadvantages of the prior art and in particular enables the technically simple synthesis of acetals of 3-methyl-2-butenal in high yields. Accordingly, the process defined at the outset was found.
- the process according to the invention is particularly suitable for those which consist of C 1 -C 2 -alkyl alcohols, such as methanol, ethanol, propanol, l-propanol, butanol, sec-butanol and t-butanol and C 3 - to C 2 o-alkenyl alcohols such as propenol, butenol, pentenol and 3-methyl-2-butenol, the corresponding orthoesters of the general formula (III), the 3 alkoxy radicals of which differ derive the aforementioned alcohols and / or form the mixtures of the aforementioned alcohols and orthoesters.
- C 1 -C 2 -alkyl alcohols such as methanol, ethanol, propanol, l-propanol, butanol, sec-butanol and t-butanol
- C 3 - to C 2 o-alkenyl alcohols such as propenol, butenol, pentenol and
- alcohols of the formula (Ila) and the orthoesters of the formula (III) are used in the form of a mixture, their molar ratio can be varied within a wide range and is generally from 0.01 to 20: 1, preferably 0, 1 . 1 to 5: 1.
- the alcohols of the formula (IIb) which are substituted by the carbonyl group of the 3-methyl-2-butenal are an optionally C] _- to C ⁇ o ⁇ alkyl-substituted acetal form, especially C ⁇ to cin-alkyl-substituted C 2 - to C -diols such as 1, 2-ethanediol, 1, 2-propanediol, 1, 3-propanediol, 1, 2-butanediol, 1, 3-butanediol, 2nd , 4-pentanediol, 2-methyl-2, 4-butaned ol and 2, 2-dimethyl-l, 3-propanedol.
- an amidosulfonic acid or alkylamidosulfonic acid is used as a catalyst in this process in a concentration of 0.001 to 10, preferably 0.001 to 5 mol%, based on 3-methyl-2-outenal.
- alcohols of the formula (Ila) or orthoesters of the formula (III) are preferably used in a molar ratio (VI), formed from the amount of 3-methyl-2-butenal and the amount of units of the formula (IVa) derived from these alcohols and orthoesters
- a uniform product of the formula (I) in which the radical R always represents the same hydrocarbon group, and the alcohols of the formula (Ila) and the orthoesters of the formula (III) or the alcohols of the formula ( Ilb) chosen so that the radical R also in the starting products is the same alkyl, alkenyl or alkanediyl group.
- the reaction is carried out in the presence of a moderate organic solvent which forms an azeotrope with water and is so poorly miscible with water at room temperature that only those mixtures predominantly containing the organic solvent exist which are less at room temperature Contain water as the azeotrope, and with this the water is distilled off.
- the azeotrope is then usually condensed, preferably cooled to a temperature below room temperature, the aqueous phase formed is separated off and the organic phase is returned to the reaction mixture.
- alcohols with 5 to 20 carbon atoms are also suitable as water tractors, which are used in a concentration of 50 to 99% by weight, based on the reaction mixture.
- the orthoesters of the formula (III) are not used if the water is removed by the azeotropic distillation process.
- the water of reaction formed can be chemically bound by a further method by using a mixture of orthoesters of the formula (III) and alcohols of the formula (Ila).
- the orthoester reacts with the water to form a monoester, releasing 2 equivalents of the alcohol, which is then also available as a starting product for the acetalization.
- the orthoester is therefore favorably used in amounts such that it is able to bind water which originates from the reaction of 3 methyl 2 -butene as with the alcohol originally used, and also water which results from the reaction of 3 methyl 2-butenal with the alcohol that was the true ⁇ reaction from the orthoester.
- reaction temperature does not require exact control and can generally be in a range from -20 ° to 150 ° C.
- the pressure to be used in the reaction is also not critical and is usually 0.1 to 1.5 bar.
- the reaction is complete when practically all of the 3-methyl-2-butenal has been consumed. This is generally the case after a reaction time of 20 mm to 20 h.
- the reaction mixture can be worked up particularly simply by adding an amount of a base, preferably an alkali or alkaline earth carbonate, e.g. Potassium carbonate or a nurse is added and then distilled directly.
- a base preferably an alkali or alkaline earth carbonate, e.g. Potassium carbonate or a nurse is added and then distilled directly.
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
Abstract
Description
Claims
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000505109A JP2001512093A (ja) | 1997-08-01 | 1998-07-20 | 3−メチル−2−ブテナールのアセタールの製造 |
| KR1020007001052A KR20010022467A (ko) | 1997-08-01 | 1998-07-20 | 3-메틸-2-부텐알의 아세탈 제조 방법 |
| DE59804528T DE59804528D1 (de) | 1997-08-01 | 1998-07-20 | Verfahren zur herstellung von acetalen des 3-methyl-2-butenals |
| US09/463,847 US6313322B1 (en) | 1997-08-01 | 1998-07-20 | Method for producing 3-methyl 2-butenal acetals |
| EP98943743A EP1003702B1 (de) | 1997-08-01 | 1998-07-20 | Verfahren zur herstellung von acetalen des 3-methyl-2-butenals |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19733258A DE19733258A1 (de) | 1997-08-01 | 1997-08-01 | Verfahren zur Herstellung von Acetalen des 3-Methyl-2-butenals |
| DE19733258.7 | 1997-08-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1999006344A1 true WO1999006344A1 (de) | 1999-02-11 |
Family
ID=7837661
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP1998/004479 Ceased WO1999006344A1 (de) | 1997-08-01 | 1998-07-20 | Verfahren zur herstellung von acetalen des 3-methyl-2-butenals |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US6313322B1 (de) |
| EP (1) | EP1003702B1 (de) |
| JP (1) | JP2001512093A (de) |
| KR (1) | KR20010022467A (de) |
| DE (2) | DE19733258A1 (de) |
| ES (1) | ES2178254T3 (de) |
| WO (1) | WO1999006344A1 (de) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2006240490A1 (en) * | 2005-04-21 | 2006-11-02 | Paladin Labs (Barbados) Inc. | Process for the preparation of ultrapure 4-methylprazole |
| GB201717210D0 (en) * | 2017-10-19 | 2017-12-06 | Bp Plc | Selective acetalization/etherification process |
| GB201717211D0 (en) | 2017-10-19 | 2017-12-06 | Bp Plc | Etherification process |
| CN114349613B (zh) * | 2022-01-11 | 2023-05-26 | 万华化学集团股份有限公司 | 一种3-甲基-2-丁烯醛的制备方法 |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2334378A1 (de) * | 1973-07-06 | 1975-01-16 | Basf Ag | 2- eckige klammer auf 2'-methyl-l'propen-1'-yl eckige klammer zu -1.3dioxane sowie deren verwendung als duftstoffe |
| EP0629619A1 (de) * | 1993-06-18 | 1994-12-21 | Bristol-Myers Squibb Company | Verfahren zur Herstellung von Zwischenprodukten, nutzbar für die Herstellung von Pyranyl Cyanguanidin Derivate |
-
1997
- 1997-08-01 DE DE19733258A patent/DE19733258A1/de not_active Withdrawn
-
1998
- 1998-07-20 ES ES98943743T patent/ES2178254T3/es not_active Expired - Lifetime
- 1998-07-20 US US09/463,847 patent/US6313322B1/en not_active Expired - Fee Related
- 1998-07-20 WO PCT/EP1998/004479 patent/WO1999006344A1/de not_active Ceased
- 1998-07-20 KR KR1020007001052A patent/KR20010022467A/ko not_active Ceased
- 1998-07-20 JP JP2000505109A patent/JP2001512093A/ja not_active Withdrawn
- 1998-07-20 EP EP98943743A patent/EP1003702B1/de not_active Expired - Lifetime
- 1998-07-20 DE DE59804528T patent/DE59804528D1/de not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2334378A1 (de) * | 1973-07-06 | 1975-01-16 | Basf Ag | 2- eckige klammer auf 2'-methyl-l'propen-1'-yl eckige klammer zu -1.3dioxane sowie deren verwendung als duftstoffe |
| EP0629619A1 (de) * | 1993-06-18 | 1994-12-21 | Bristol-Myers Squibb Company | Verfahren zur Herstellung von Zwischenprodukten, nutzbar für die Herstellung von Pyranyl Cyanguanidin Derivate |
Also Published As
| Publication number | Publication date |
|---|---|
| DE59804528D1 (de) | 2002-07-25 |
| DE19733258A1 (de) | 1999-02-04 |
| EP1003702B1 (de) | 2002-06-19 |
| US6313322B1 (en) | 2001-11-06 |
| EP1003702A1 (de) | 2000-05-31 |
| KR20010022467A (ko) | 2001-03-15 |
| ES2178254T3 (es) | 2002-12-16 |
| JP2001512093A (ja) | 2001-08-21 |
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