Perfluoroalkyl derivatives of sulphur. Part X. The reaction of polyfluoromonoiodoalkanes with dimethyl sulphide to give methyl polyfluoroalkyl sulphides

Polyfluoromonoiodoalkanes react photochemically with dimethyl sulphide to give as major products the corresponding methyl polyfluoroalkyl sulphides, the corresponding 1H-polyfluoroalkanes, 2,4-dithiapentane and trimethylsulphonium iodide. Thermal reaction of heptafluoro-1-iodopropane with dimethyl sulphide gives a higher yield of 1H-heptafluoropropane, at the expense of methyl heptafluoropropyl sulphide, than in the corresponding photochemical reaction. The products are explained on the basis of a free-radical mechanism.