Abstract: N-Aryl-S, S-dimethylsulfimides 3 (Ar= 4-NO 2 C 6 H 4), 4 (Ar= Ph) and 5 (Ar= 4-Tol) react with Appel salt 1 to give the corresponding N-aryl-(4-chloro-5 H-1, 2, 3- dithiazolylidene) benzenamines 8 (Ar= 4-NO2C6H4), 9 (Ar= Ph) and 10 (Ar= 4-Tol) in 84, 94 and 87% yields, respectively. The reaction proceeds in the absence of base and a proposed reaction mechanism is given.