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

摘要

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 DEG to 250 DEG C. with an acid or basic catalyst.