Alkyl thiocyanates 3 react with acyl chloride/SbCl5 to give N-benzoyl-C-(methylthio)nitrilium hexachloroantimonate(V) (4) or the 2-aryl(alkyl)-4,6-bis(alkylthio)-1,3,5-oxadiazinium hexachloroantimonates (V) 6.Reactions of 6 with water yield the isothioure