ELECTROCHEMICAL SYNTHESIS OF NEW N,N-BIS(TRIFLUOROMETHYL) PERFLUOROALKANESULPHONAMIDES

The electrochemical fluorination (ECF) of N,N-dimethyltrifluoromethane sulphonamide and N,N-dimethylnonafluorbutanesulphonamide gives the cor responding perfluorinated N,N-bis(trifluoromethyl) perfluoroalkanesulp honamides in good yield. In contrast, the ECF of N,N-dimethylmethanesu lphonamide results in decomposition of the starting material. The natu re of the partially fluorinated by-products serves to clarify the mech anism of ECF, which strongly depends on the formation of nickel fluori des of higher oxidation number on the anodic surface.