in benzene byproducts: H2O; reflux, 30 min; distg. off benzene and H2O, recrystg. oily residue by dissolving in benzene, adding hexane and allowing to stand at room temp., 3 d; elem. anal.;

C6H4(4-SMe)COOH in toluene elem. anal.;

in toluene azeotropic dehydration by refluxing stoichiometric amounts of triphenyltin hydroxide and the arylcarboxylic acid in toluene, 2 hours;; pure after removal of toluene; elem. anal.;;