SODIUM TETRABORATE-DIBENZO-18-CROWN ETHER-6 COMPLEX AS REAGENT IN THE SYNTHESIS OF CINNAMIC ACIDS FROM AROMATIC ALDEHYDES AND ALIPHATIC CARBOXYLIC ACIDS

摘要

Cinnamic acids have been prepared in 74-81% yields by a new synthesis from aromatic aldehydes and aliphatic carboxylic acids in the presence of anhydrous sodium tetraborate-dibenzo-18-crown ether-6 complex as reagent, 4-dimethylaminopyridine as activating agent, pyridine as base, and N-methyl-2-pyrolidinone as solvent, at reflux (180-190℃) for 10-12 hours.