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 washing with light petroleum; elem. anal.;

in benzene heating with distn. off of water (2 h); solvent removal, recrystn. (petroleum ether); elem. anal.;