previously developed for the preparation of perfluoroalkyl sulfilimines by a reaction between fluorinated sulfoxides and nitriles, has been successfully extended to dinitriles. According to the reaction conditions, we can preferentially produce a cyano monosulfilimine or a bis(sulfilimine). New cyano thioethers have been synthesized through a rearrangement process. Mono- and bis(sulfilimine)s were also