P. Camps et al., EASY AND GENERAL-METHOD FOR THE PREPARATION OF M-ACYLBENZOIC AND P-ACYLBENZOIC ACIDS - A NEW SYNTHESIS OF RAC-SUPROFEN, Liebigs Annalen der Chemie, (6), 1993, pp. 641-643
A method for the preparation of m- and p-acylbenzoic acids 3 based on
the Claisen condensation of isophthalic or terephthalic diesters 1 wit
h alpha-methylenecarboxylic esters 2 is described. p-Propionylbenzoic
acid p-4 (R = Me) is used in a new synthesis of rac-suprofen (11).