WO9723448-A1  BERICHTE DER DEUTSCHEN CHEMISCHEN GESELLSCHAFT, vol. 75, 1942, WEINHEIM DE, pages 532-536, XP002025808 B. HELFERICH, ET AL.: "Bis-(alkylsulfonsaeure)-imide";  INORGANIC AND NUCLEAR CHEMISTRY LETTERS, vol. 7, no. 2, 1971, OXFORD, GB, pages 171-175, XP000618718 H.W. ROESKY, ET AL.: "Darstellung von N-Trifluoromethansulfonyl-sulfonylfluorida mid und einge Reaktionen";  JOURNAL OF FLUORINE CHEMISTRY, vol. 52, no. 1, 1 April 1991, LAUSANNE, CH, pages 7-12, XP002025807 D.D. DESMARTEAU, ET AL.: "N-Fluoro-bis(trifluoromethanesulphonyl)- imide. An improved synthesis";  JOURNAL OF FLUORINE CHEMISTRY, vol. 72, no. 2, June 1995, LAUSANNE, CH, pages 203-204, XP002025806 D.D. DESMARTEAU: "Novel perfluorinated ionomers and ionenes";  JOURNAL OF ORGANIC CHEMISTRY, vol. 46, no. 5, 27 February 1981, WASHINGTON, DC, US, pages 1012-1014, XP002025809 I.P. BLEEKER, ET AL.: "1H and 13C CIDNP study of the radical rearrangement involved in the reaction of tert-butylsulphinyl chloride with N-hydroxysulphonamides";  See also references of EP 0904265A1;  BERICHTE DER DEUTSCHEN CHEMISCHEN GESELLSCHAFT, vol. 75, 1942, WEINHEIM DE, pages 532-536, XP002025808 B. HELFERICH, ET AL.: "Bis-(alkylsulfons{ure)-imide"US5874616-A  Banks, R. E., (ed )Preparation, Properties, and Industrial Applications of Organofluorine Compounds, ed. John Wiley: New York, (1982) pp. 37-43.;  Chen et al., "Iodofluoroalkylsulfonyl Fluorides Synthesis and Conversion to New Derivatives," J. Fluorine Chemistry, vol. 43 (1989) pp. 329-347.;  D.D. Desmarteau, et al., "N-Fluoro-bis(trifluoromethanesulphonyl)imide. An Improved Synthesis," Journal of Fluorine Chemistry, vol. 52, No. 1, pp. 7-12, (1991).;  Des Marteau, Novel Fluorinated Acids For Phosphoric Acid Fuel Cells, Gas Res. Inst. Rep. #PB93-132710, (Jul. 1992).;  DesMarteau, "Novel Perfluorinated Ionomers and Ionenes," J. Fluorine Chem., vol. 72, (1995) pp. 203-208.;  Foropoulos, J., et al., "Synthesis, Properties, and Reactions of Bis ((trifluoromethyl) sulfonyl) Imide, (CF3SO2)2NH1," Inorganic Chemistry, vol. 23, (1984), pp. 3720-3723.;  Gard et al., "(Pentafluoro- lambda 6-sulfanyl)difluoromethanesulfonyl Fluoride and Derivatives," Inorg. Chem. vol. 29 (1990) pp. 4588-4590.;  Haszeldine et al., "Perfluoroalkylk Derivatives of Sulphur. Part II," J. Chem. Soc., (1955) pp. 2901-2010.;  Hu, et al., "Synthesis of Perhaloalkanesulfonyl Halides and Their Sulfonimide Derivatives," Inorg. Chem., vol. 32, (1993) pp. 5007-5010.;  Huang, "The Recent Progress of Fluoroorganic Chemistry in China," J. Fluorine Chem., vol. 32, (1986) pp. 179-195.;  Hudlicky, M., Chemistry of Organic Fluorine Compounds, 2nd ed., PTR Prentice Hall (N.Y.) pp. 73-76.;  I.P. Bleeker, et al., "1H and 13C CIDNP Study of the Radical Rearrangement Involved in the Reaction of tert-Butylsulfinyl Chloride with N-Hydroxysulfonamides," vol. 46, No. 5, pp 1012-1014, (1981).;  Krutak, et al., "Chemistry of Ethenesulfonyl Fluoride. Fluorosulfonylethylation of Organic Compounds," J. Organic Chem., vol. 44, No 22, (1979) pp. 3847-3858.;  Mohtasham et al., " beta -Fluorosultones: Synthesis, Reactivity, Structure and Uses," Coordination Chemistry Reviews, vol. 112, (1992), pp. 47-79.;  Singh et al., "Chemistry of Perfluoromethylsulfonyl Perfluorobutylulfonyl Imide," Inorg. Chem., vol. 29, (1990) pp. 2982-2984.;  Stang et al., "Perfluoroalkanesulfonic Esters: Methods of Preparation and Applications in Organic Chemistry," Synthesis, (1982) pp. 85-124.;  Temple, Stanley, "The Reaction of Sulfuryl Fluoride and Sulfonyl Florides with Fluoro Olefins," J. Organic Chemistry, vol. 33 No. 1, (1968) pp. 344-346.;  Terjeson et al., "New Fluorosulfonyl-Containing MonomersPolymers," J. Fluorine Chemistry,vol. 38 (1988) pp. 3-18.;  Waterfeld, "A New Cyclic Fluorinated Trisulfone (CF2SO2)3 and Fluorinated Derivatives: SO2(CF2SO2F)2, CF2(SO2CF3)2, CF3SO2CF2SO2F, CF2(SO2F)2andCF3SO2CF2SO2CF2SO2F," J. Fluorine Chemistry, vol. 67 (1994) pp. 27-31.EP904265-A1  See also references of WO 9723448A1