Process for the preparation of a mixture of an optionally substituted ester of cinnamic acid and an optionally substituted ester of beta-alcoxy-beta-phenylpropionic acid, and process for the preparation of optionally substituted cinnamic acid

摘要

By reacting an optionally substituted benzaldehyde with an optionally substituted acetic acid ester and an alcoholate in the presence of an alcohol, a mixture of an optionally substituted cinnamic acid ester and an optionally substituted β-alkoxy-β-phenyl-phenyl-propionic acid ester is prepared. The reaction can be carried out in a wide temperature range from -20 ° C to + 150 ° C. The ester mixture can be saponified acidic or alkaline to give optionally substituted cinnamic acid.