Patent ID: 8067585

Claim:
A method for producing a compound represented by the following formula (2), which comprises subjecting a compound represented by the following formula (1) in which Y is a fluorine atom to photocoupling reaction or the compound in which Y is a hydroxyl group, —OMa or —O(M b ) 1/2 to electrolytic coupling reaction, to obtain the compound represented by the following formula (2): FSO 2 -E-CX 2 —COY (1) FSO 2 -E-CX 2 —CX 2 -E-SO 2 F (2) wherein E is a single bond, an etheric oxygen atom, a C 1-20 alkylene group which may contain an etheric oxygen atom, or a group having at least one hydrogen atom in such an alkylene group substituted by a fluorine atom and/or a chlorine atom; X each independently is a hydrogen atom, a chlorine atom or a fluorine atom; and Y is a fluorine atom, a hydroxyl group, —OM a (wherein M a is an alkali metal atom) or —O(M b ) 1/2 (wherein M b is an alkaline earth metal atom).