1-Chloro-4-[2-(4-chlorophenyl)ethyl]benzene was a useful compound for studying the effect of solvent on photolysis of 3-?chloro- and 4-?chloro substituted benzyl chlorides. An impurity Clobutinol Hydrochloride (C583600(M)), which is a non-narcotic antitussive drug useful for treatment of acute respiratory diseases.