Patent ID: 7335787

Claim:
A method for producing an onium salt derivative, characterized by comprising reacting an onium salt which has a halide Q as an anion moiety and which is represented by any one of formulas (3) or (4): wherein each of R 1 , R 2 , R 3 , and R 5 represents an alkyl group, a cycloalkyl group, a perfluoroalkyl group, an aromatic organic group, an aralkyl group, or a phenacyl group, each of these groups having ≦25 carbon atoms and being optionally substituted; one or both of the pairs of R 1 and R 3 , and R 2 and R 5 may together form a divalent organic group; R 4 represents a C≦20 divalent organic group; and Q represents a halide anion, with an ester compound which has an alkyl group R 7 and which is represented by formula (5): wherein R 6 represents an alkyl group, a cycloalkyl group, a perfluoroalkyl group, an aromatic organic group, or an aralkyl group, each of these groups having ≦25 carbon atoms and being optionally substituted; R 7 represents an alkyl group, having ≦5 carbon atoms and being optionally substituted; to thereby form R 7 Q through nucleophilic attack by the halide Q on the alkyl group R7 of the ester compound, and to also produce an onium salt derivative which is formed of an anion represented by R 6 SO 2 O—, derived from the ester compound and an onium cation derived from the onium salt, an onium salt derivative represented by formulas (10) or (11)