Six new substituted phenyl mesityl sulfones have been synthesized. Treatment of these sulfones with n-butyllithium re-sults in their rearrangement to the corresponding 2- (substituted benzyl)-4, 6-dimethylbenzenesulfinic acids when the substituent on the phenyl ring is m-chloro, p-chloro, m-methoxy, gmethoxy, p-trifluoromethyl, and 3, 4, 5-trimethyl. Only a trace of acid was isolated when the substituent was m-trifluoromethyl.