Аннотация:Abstract: It is shown that fluoroaliphatic sulfonyl halides are reduced under the action of phosphorus trihalides with formation of the corresponding disulfides, including those containing such functional groups as fluorosulfonyl, carboxymethyl, and also trifluorovinyloxy groups. Reaction intermediates are perfluoroalkane sulfinyl halides and perfluoroalkane sulfene halides. Formation of the latter is confirmed by synthesis of adducts of the corresponding sulfene halides with unsaturated hydrocarbons.