Abstract Benzene, toluene, and 2-chlorothiophene regioselectively react with N-(2, 2- dichloro-2-phenyl-ethylidene) arenesulfonamides in the presence of oleum to give N-[1-aryl (or hetaryl)-2, 2-dichloro-2-phenylethyl] arenesulfonamides. Analogous C-amidoalkylation products are formed by the action of N-(2, 2-dichloro-1-hydroxy-2-phenylethyl)-and N-(1- arylsulfonylamino-2, 2-dichloro-2-phenylethyl) arenesulfonamides on toluene and 2- ...