Patent ID: 7781612

Claim:
A process for producing a fluorinated sulfonyl fluoride represented by the following formula (4), which comprises oxidizing a compound represented by the following formula (1) with an oxidizing agent comprising a halogen atom to obtain a compound represented by the following formula (2), and in a case that X in the compound represented by the formula (2) is a fluorine atom, reacting the compound with fluorine in a liquid phase as it is, to obtain a compound represented by the following formula (3), and in a case that X in the compound represented by the formula (2) is a halogen atom other than a fluorine atom, converting X into a fluorine atom, and then reacting the obtained compound with fluorine in a liquid phase to obtain a compound represented by the following formula (3), and then decomposing the compound represented by the formula (3): Y—S—R A -E-R B (1) XSO 2 —R A -E-R B (2) FSO 2 —R AF -E F -R BF (3) FSO 2 —R AF —COF (4) wherein R A is a bivalent organic group; R B is a monovalent organic group; E is —CH 2 OCO—, and the carbon atom constituting the keto group in E is bonded to R A or R B ; Y is a hydrogen atom, a monovalent organic group or a —SO 3 M group (wherein M is an alkali metal atom); X is a halogen atom; R AF is the same group as R A or a bivalent organic group having R A fluorinated; R BF is the same group as R B or a monovalent organic group having R B fluorinated; and E F is —CF 2 OCO—, and the carbon atom constituting the keto group in E F is bonded to R AF or R BF .