Process for the preparation of cinnamic acids which are optional

Details Process for the preparation of cinnamic acids which are optional Process for the preparation of cinnamic acids which are optional

1985-06-11

1986-09-23

Killos, Paul J.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acids and salts thereof

560104, C07C 6364

Patent

active

046136924

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.

REFERENCES:
The Journal of Organic Chemistry, Band 15, No. 3, May 1950, pp. 451-456, J. F. J. Dippy and R. M. Evans, "The Nature of the Catalyst in the Perkin Condensation".

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