Patent ID: 6790990
Filing Date: 2004-09-14
Classification: C07C

Abstract:
A process for forming at a yield greater than 50 mol-% a monomeric composition represented by the formula(CF2=CFOCF2CFXSO2N(M)SO2R)y where X is F or perfluoroalkyl having 1-4 carbons optionally substituted by ether oxygen, M is an alkali or alkaline earth metal when â€œyâ€  is respectively 1 or 2, R is aryl, fluoro-aryl, or XCF2-where X is H, halogen, fluorinated or non-fluorinated linear alkyl having 1-10 carbons or cyclic alkyl having 3-10 carbons, optionally substituted by one or more ether oxygens; the process comprising:contacting in an inert atmosphere a cyclic sulfone represented by the structure wherein X is F or perfluoroalkyl having 1-4 carbons optionally substituted by ether oxygen witha composition comprising sulfonyl amide salts of which said salts at least 50 mol-% are dimetal sulfonyl amide salts represented by the formula (RSO2NMb)3-bMâ€²c, wherein R is aryl, fluoro-aryl, or XCF2-where X is H, halogen, fluorinated or non-fluorinated linear alkyl radicals having 1-10 carbons or cyclic alkyl radicals having 3-10 carbons, optionally substituted by one or more ether oxygens, Mâ€² is an alkaline earth metal, b=1 or 2, c=0 or 1, M is alkaline earth or alkali metal when b is 1 or 2 respectively and c=0, and M is alkali metal when b=1 and c=1, with the proviso that câ‰ 1 when b=2, thereby forming a ring-opening reaction mixture; reacting said ring-opening reaction mixture at a temperature in the range of 0 to 67Â° C.