Patent ID: 6274677
Filing Date: 2001-08-14
Classification: C07C,C08F

Abstract:
A process for preparing a vinyl ethersulfonic acid derivative comprising the steps of:converting a compound of formula (1):FSO.sub.2 CFXCF.sub.2 O(CFXCF.sub.2 O).sub.n CF(CF.sub.2 Y)COF (1)wherein X is a fluorine atom, a chlorine atom or a trifluorometyl group, Y is a fluorine atom, a chlorine atom a bromine atom or an iodine atom, and n is a number of 0 to 5, to a compound of formula (2):MOSO.sub.2 CFXCF.sub.2 O(CFXCF.sub.2 O).sub.n CF(CF.sub.2 Y)COOM.sup.1 (2)wherein X, Y and n are the same as defined above, and M and M.sup.1 independently represent an alkali metal or an alkaline earth metal atom, andpyrolizing a compound of the formula (2) at a temperature of 150 to 250.degree. C. to obtain a compound of formula (3):MOSO.sub.2 CFXCF.sub.2 O(CFXCF.sub.2 O).sub.n CF.dbd.CF.sub.2 (3)wherein X, M and n are the same as defined above.