Patent ID: 6624328
Filing Date: 2003-09-23
Classification: C07C,C25B

Abstract:
A method of making a perfluorinated vinyl ether having a sulfonyl fluoride end-group according to the formula FSO2â€”(CF2)nâ€”Oâ€”CF&boxH;CF2, where n is 2-5, comprising the steps of:a) fluorination of: â€ƒto produce FSO2â€”(CF2)(nâˆ’1)â€”COF; b) reaction of FSO2â€”(CF2)(nâˆ’1)â€”COF with hexafluoropropylene oxide (HFPO) to produce FSO2â€”(CF2)(n)â€”Oâ€”CF(CF3)â€”COF; c) reaction of FSO2â€”(CF2)(n)â€”Oâ€”CF(CF3)â€”COF with a salt of a metal cation M+P , where p is the valence of M, to produce (FSO2â€”(CF2)(n)â€”Oâ€”CF(CF3)â€”COOâˆ’)pM+P; and d) thermal cracking of FSO2â€”(CF2)(n)â€”Oâ€”CF(CF3)â€”COOâˆ’)pM+P to produce FSO2â€”(CF2)(n)â€”Oâ€”CF&boxH;CF2.