in ethanol byproducts: NaCl; refluxed in abs. EtOH for 3-4 h; concd., cooled, filtered, benzene was added to the filtrate, mixt. was refluxed for ca. 2 h in a Dean-Stark apparatus filtering off any sepd. NaCl, solvent was removed, residue was purified by recrystn. from EtOH; elem. anal.;