WO2003097584A1 - Verfahren zur katalysatorfreien herstellung von alkoxybenzonitrilen - Google Patents
Verfahren zur katalysatorfreien herstellung von alkoxybenzonitrilen Download PDFInfo
- Publication number
- WO2003097584A1 WO2003097584A1 PCT/EP2003/005176 EP0305176W WO03097584A1 WO 2003097584 A1 WO2003097584 A1 WO 2003097584A1 EP 0305176 W EP0305176 W EP 0305176W WO 03097584 A1 WO03097584 A1 WO 03097584A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- alcoholate
- reaction mixture
- reaction
- catalyst
- alkyl
- 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
- C07C253/00—Preparation of carboxylic acid nitriles
- C07C253/30—Preparation of carboxylic acid nitriles by reactions not involving the formation of cyano groups
Definitions
- the present invention relates to a process for the catalyst-free preparation of alkoxybenzonitriles by substitution of monohalogenated starting compounds of a defined formula.
- Alkoxybenzonitriles are very important intermediates in the synthesis of numerous agricultural and pharmaceutical products.
- the starting compounds are not aromatic nitriles.
- halogenated benzonitriles are reacted with metal alcoholates, an expensive palladium or nickel compound being used in combination with a corresponding expensive ligand as a catalyst.
- the catalytic dehalogenation of halogenated aryls using a Pd / imidazole salt system according to Organometalips, 2001, 20, 6, 3607-361 2 is also known.
- Boiling temperature to 2-chloro-6-methoxybenzonitrile whereby a yield between 75 and 80% is achieved.
- this variant is limited to very activated nitriles.
- the object of the present invention is therefore to provide a process for the catalyst-free preparation of alkoxybenzonitriles.
- the target compounds should be obtained as directly as possible in good yields and purities and the use of expensive and environmentally harmful substances should be completely eliminated.
- the process according to the invention preferably further comprises one or more steps selected from cooling the reaction mixture to 10 ° C. to 40 ° C., in particular to room temperature, for example 18 to 27 ° C., adding water to the reaction mixture and / or separating off the end product. After the reaction mixture has been kept at the final temperature, the reaction mixture is particularly preferably cooled to 10 ° C. to 40 ° C., in particular to room temperature, stirred after the addition of water and finally the end product is separated off.
- the radical Y can be arranged ortho, metha or para to the CN grouping.
- Y represents an alkyl group
- the alkyl group can be straight-chain or branched.
- Y is aryl, it is preferably a C 4 -C 30 , more preferably a C 5 -C 20 and most preferably a C 6 -C 15 aryl radical.
- the monohalogenated benzonitriles used are preferably chlorinated or brominated benzonitriles in the 2- or 4-position, the preparation of which is well known from the literature.
- Sodium methylate or sodium ethylate are to be regarded as preferred alcoholates.
- the reaction is carried out at temperatures between 90 and 250.degree. C., but preferably temperatures which have been found to be particularly suitable are between 100 and 150.degree. C. and particularly preferably between 115 and 140.degree.
- the reaction mixture should be kept for a period of 2 to 10 hours and in particular for 3 to 5 hours at the respective end temperature within the scope of the invention.
- the pressure naturally increases in a closed system, as autoclaves represent, pressure ranges of usually 2 to 20 bar being acceptable and a pressure of about 3 to 5 bar being recommended.
- reaction mixture can also be kept under reflux for a long time, for example three hours, and only then can the reaction mixture be reacted at the final temperature for a further 2 to 3 hours.
- the present invention preferably provides for the reaction to be carried out under an inert gas and in particular under a nitrogen atmosphere.
- the amount of alcoholate used in the claimed process is not critical and can be between 70 mol% and 400 mol%, based on the monohalogenated benzonitrile used. However, it is recommended that the amount of alcoholate be between 1 00 and 200 mol%, based on the halogenated benzonitrile used, and especially between 105 and 1 1 5 mol%.
- the metal alcoholate is used in the form of a corresponding alcoholic solution.
- concentration of this solution is also not critical and can be between 1 5 and 50 wt .-%. However, it is recommended that the concentration of the alcoholate solution to be used be between 20 and 40% by weight and in particular between 25 and 35% by weight.
- the subsequent separation of the product is carried out according to the usual methods, with filtering off for solid products and phase separation for liquid products, of course, being recommended. Finally, if necessary, the product can be freed of the residual moisture by mild temperatures of approx. 30 to 50 ° C.
- the reaction mixture at the end of the reaction is a suspension of sodium and / or potassium salt and alkoxybenzonitrile fractions in the corresponding alcohol.
- the product can easily be separated from this system by adding water and stirring.
- the salt completely dissolves and, in the case of solid benzonitrile derivatives, the product precipitates. It is particularly advantageous to cool the suspension thus obtained with thorough mixing, the product being obtained practically quantitatively.
- the crystals obtained in this way can be separated from the liquid phase in any conventional manner.
- the product is usually dried at pressures between 0.1 and 1000 mbar and at temperatures between 20 and 40 ° C, with pressures between 10 and 20 mbar and temperatures between 25 and 35 ° C being particularly recommended.
- the method according to the invention is characterized by a very simple technical feasibility and also by a high degree of compatibility with the world.
- the only by-product of the reaction is sodium or potassium halides, which further underlines the environmental compatibility and economy of the proposed process.
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 (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10/515,090 US20060025624A1 (en) | 2002-05-17 | 2003-05-16 | Method for the catalyst-free production of alkoxybenzonitriles |
| JP2004505317A JP2005530793A (ja) | 2002-05-17 | 2003-05-16 | アルコキシベンゾニトリルの触媒不含の製造方法 |
| EP03752756A EP1506163A1 (de) | 2002-05-17 | 2003-05-16 | Verfahren zur katalysatorfreien herstellung von alkoxybenzonitrilen |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10222330.0 | 2002-05-17 | ||
| DE10222330A DE10222330A1 (de) | 2002-05-17 | 2002-05-17 | Verfahren zur katalysatorfreien Herstellung von Alkoxybenzonitrilen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2003097584A1 true WO2003097584A1 (de) | 2003-11-27 |
Family
ID=29285603
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2003/005176 Ceased WO2003097584A1 (de) | 2002-05-17 | 2003-05-16 | Verfahren zur katalysatorfreien herstellung von alkoxybenzonitrilen |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20060025624A1 (de) |
| EP (1) | EP1506163A1 (de) |
| JP (1) | JP2005530793A (de) |
| DE (1) | DE10222330A1 (de) |
| WO (1) | WO2003097584A1 (de) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015177344A1 (de) * | 2014-05-23 | 2015-11-26 | Alzchem Ag | Verfahren zur herstellung von alkoxybenzonitrilen |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100386308C (zh) * | 2006-06-09 | 2008-05-07 | 武汉大学 | 一种制备3-氯-4-烷氧基苯腈的方法 |
| CN100351226C (zh) * | 2006-06-09 | 2007-11-28 | 武汉大学 | 一种制备2,6-二烷氧基苯腈的方法 |
| CN100386309C (zh) * | 2006-06-09 | 2008-05-07 | 武汉大学 | 一种制备2-氯-6-烷氧基苯腈的方法 |
| CN102311364B (zh) * | 2011-09-30 | 2014-07-09 | 江苏联化科技有限公司 | 一种邻(对)羟基苯甲腈的制备方法 |
| WO2014186981A1 (zh) * | 2013-05-24 | 2014-11-27 | 江苏联化科技有限公司 | 一种邻(对)羟基苯甲腈的制备方法 |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998015515A1 (en) * | 1996-10-10 | 1998-04-16 | Massachusetts Institute Of Technology | Synthesis of aryl ethers, methods and reagents related thereto |
| US6008401A (en) * | 1997-02-21 | 1999-12-28 | Nippon Oil Co., Ltd. | Process for producing an optically active compound |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5965766A (en) * | 1996-09-24 | 1999-10-12 | Rohm And Haas Company | Process for synthesizing benzoic acids |
| US5917079A (en) * | 1996-09-24 | 1999-06-29 | Rohm And Haas Company | Process for synthesizing benzoic acids |
-
2002
- 2002-05-17 DE DE10222330A patent/DE10222330A1/de not_active Withdrawn
-
2003
- 2003-05-16 WO PCT/EP2003/005176 patent/WO2003097584A1/de not_active Ceased
- 2003-05-16 EP EP03752756A patent/EP1506163A1/de not_active Withdrawn
- 2003-05-16 JP JP2004505317A patent/JP2005530793A/ja active Pending
- 2003-05-16 US US10/515,090 patent/US20060025624A1/en not_active Abandoned
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998015515A1 (en) * | 1996-10-10 | 1998-04-16 | Massachusetts Institute Of Technology | Synthesis of aryl ethers, methods and reagents related thereto |
| US6008401A (en) * | 1997-02-21 | 1999-12-28 | Nippon Oil Co., Ltd. | Process for producing an optically active compound |
Non-Patent Citations (2)
| Title |
|---|
| KAWAMATSU, Y. ET AL: "2-Amino-4-phenylthiazole derivatives as anit-atherogenic agents", EUROPEAN JOURNAL OF MEDICINAL CHEMISTRY - CHIMICA THERAPEUTICA, vol. 16, no. 4, 1981, pages 355 - 362, XP002254107 * |
| WIDENHOEFER, R. A.; BUCHWALD, S. L.: "Electronic Dependence of C-O Reductive Elimination from Palladium (Aryl)neopentoxide Complexes", JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, vol. 120, no. 26, 1998, pages 6504 - 6511, XP002254108 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015177344A1 (de) * | 2014-05-23 | 2015-11-26 | Alzchem Ag | Verfahren zur herstellung von alkoxybenzonitrilen |
| DE102014007527A1 (de) | 2014-05-23 | 2015-12-17 | Alzchem Ag | Verfahren zur Herstellung von Alkoxybenzonitrilen |
Also Published As
| Publication number | Publication date |
|---|---|
| DE10222330A1 (de) | 2003-11-27 |
| US20060025624A1 (en) | 2006-02-02 |
| EP1506163A1 (de) | 2005-02-16 |
| JP2005530793A (ja) | 2005-10-13 |
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