Patent · US Expired

Process for the preparation of cinnamic acids which are optionally substituted in the nucleus

US4613692A · kind A · utility

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14Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Bernhard Beitzke · Bensberg, DE
Volkmar Handschuh · Burscheid, DE
Heinz U. Blank · Odenthal, DE

Key dates

Filing date	Jun 11, 1985
Grant date	Sep 23, 1986
Priority date	—
Expiry date	Jun 11, 2005

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C51/353
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

A process for the preparation of cinnamic acid is provided by the present invention in which an optionally substituted benzaldehyde and alkali metal salt of carboxylic acid and/or alkali metal (bi) carbonate, as condensing agents, are heated up to a temperature of 100.degree.-220.degree. C. and thereafter there is introduced into the so heated mixture acetic anhydride in at least a stoichiometric amount based upon the amount of optionally substituted benzaldehyde employed. The process can be carried out by heating up a reaction mixture to 100.degree.-220.degree. C. which is free of acetic anhydride or one which contains acetic anhydride but less than a stoichiometric amount thereof based upon the amount of optionally substituted benzaldehyde.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.