Ps. Rao et Rv. Venkataratnam, ANHYDROUS ZINC-CHLORIDE CATALYZED SYNTHESIS OF 2-PHENYL-4-ARYLIDENE-5(4H)-OXAZOLONES, Indian journal of chemistry. Sect. B: organic chemistry, including medical chemistry, 33(10), 1994, pp. 984-985
An improved procedure is reported for the synthesis of arylidene oxazo
lones from hippuric acid and aromatic aldehydes in the presence of ace
tic anhydride and anhydrous zinc chloride in 62-76% yields.