Abstract Reactions of 2, 6-disubstituted 1, 4, 3, 5-octathiadiazine-4, 4-dioxides with cyano- containing compounds (nitriles, thiocyanates, N, N-disubstituted cyanamides) proceeding with replacement of imine fragment in dioxide by corresponding fragment of cyanide were investigated. The limits of the reaction were revealed determined by electronic effects of substituents R 1 and R 2 in dioxide and R 3 in cyanide. Transimination occurred in ...