The photolysis of lb in either carbon tetrachloride or bromotrichloromethane gave the cyclohexadienones 8 and 9b as well as a tert-butyl halide. The same products were obtained whether 300-or 350-nm light was used, but the use of 350-nm light resulted in a much lower conversion of lb. Rloreover, 10 was produced either by irradiating lb in bromotrichloromethane containing 10% methanol or by stirring a mixture of 8 in methanol ...
