Patent ID: 7318991

Claim:
A heterocycle-containing onium salt shown by the general formula [1]: [wherein R is a group shown by the general formula [2]: (wherein R 3 and R 4 are each independently a halogen atom, an alkyl group which may have a halogen atom or an aryl group as a substituent, or an aryl group which may have a halogen atom or an alkyl group having 1 to 6 carbon atoms as a substituent; X 2 is an oxygen atom or a sulfur atom; i is an integer of 0 to 4; and j is an integer of 0 to 3), or a group shown by the general formula [3]: (wherein R 5 and R 6 are each independently a halogen atom, an alkyl group which may have a halogen atom or an aryl group as a substituent, or an aryl group which may have a halogen atom or an alkyl group having 1 to 6 carbon atoms as a substituent; X 3 and X 4 are each independently an oxygen atom or a sulfur atom; p is an integer of 0 to 2; and q is an integer of 0 to 3); R 1 and R 2 are each independently a halogen atom, an alkyl group which may have a halogen atom or an aryl group as a substituent, or an aryl group which may have a halogen atom or an alkyl group having 1 to 6 carbon atoms as a substituent; in and n are each independently an integer of 0 to 5; and A is a halogen atom or an anion derived from an inorganic strong acid, an organic acid or a compound shown by the general formula [4]: HM 1 (R 7 ) 4 [4] (wherein M 1 is a boron atom or a gallium atom; and R 7 is an aryl group which may have a substituent selected from a haloalkyl group having 1 to 6 carbon atoms, a halogen atom, a nitro group and a cyano group)].