Process for fluorination of sulphonyl halide compounds

The preparation of a compound of formula (I) comprising an -SO2F function by reacting a compound of formula (II) with a fluorinating agent chosen from hydrofluoric acid and an ionic fluoride of a monovalent or divalent cation is described: R-SO2F (I) R'-SO2X (II) where R is chosen from the groups R1, R2 and R3: R1 = -CnHaFb with n=1-10, a+b = 2n+1, b >= 1; R2 = -CxHyFz-SO2F with x = 1-10, y+z = 2x and z >= 1; R3 = [Phi]-CcHhFf with c = 1-10; h+f = 2c and f >= 1; where R' is chosen from the following groups R'1, R'2 and R'3: R'1 = -CnHaXb with n=1-10, a+b = 2n+1, b >= 1; R'2 = -CxHyXz-SO2X with x = 1-10, y+z = 2x and z >= 1; R'3 = [Phi]-CcHhXf with c = 1 -10; h+f = 2c and f >= 1; [Phi] denoting a phenyl group, X = Cl, Br.