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A more complete dehydrogenation of a crude product mixture of the ketonic decarboxylative coupling of 3,4-dimethyl-3-cyclohexene carboxylic acid was accomplished by passing the crude product mixture over a 0.5 wt % platinum on alumina catalyst at a temperature of 385° C. This resulted in a 60 to 75% yield of 3,3',4,4'-tetramethylbenzophenone. The 3,4-dimethyl-3-cyclohexene carboxylic acid had been contacted with a 19 wt % MnO2 /Al2O3 catalyst at a temperature of about 360° C. and a pressure of about 15 psia for a contact time of about 7 sec.

1. customat a temperature of 385° C