Efficient Preparation of (Fluorosulfonyl)(pentafluoroethanesulfonyl)imide and Its Alkali Salts

Abstract New alkali salts based on (fluorosulfonyl)(pentafluoroethanesulfonyl)imide {[(FSO2)(C2F5SO2)N]−, FPFSI−} anion are introduced, together with a new effective preparation of C2F5SO2NH2 and H[FPFSI]. The former amide was prepared by amination of lithium pentafluoroethanesulfinate (C2F5SO2Li) with NH2OSO3H, which was converted to the H[FPFSI] by sequential chlorosulfonation with SOCl2/ClSO3H, and fluorination by SbF3.