Process for the preparation of optionally substituted cinnamic acid in the presence of a catalyst

US4609756A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Alfons Dorlars · Leverkusen, DE
• Heinz U. Blank · Odenthal, DE
• Herbert Nordt, deceased · Leverkusen, DE
• Viktor Trescher · Leverkusen, DE

Key dates

• Filing date: Oct 4, 1985
• Grant date: Sep 2, 1986
• Expiry date: Oct 4, 2005

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J2231/341
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

In the preparation of a cinnamic acid by reacting the corresponding benzaldehyde with ketene in the presence of a catalyst, the improvement which comprises using as the catalyst an iron and/or zinc salt of a mono- or di-carboxylic acid with 2 to 20 carbon atoms containing free carboxylic acid and/or anhydride, and then splitting the reaction product in the temperature range from 100.degree. to 250.degree. C. with an acid or basic catalyst.