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-continued 

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In the present invention, a compound (PA) other than the compound capable of generating a compound represented by formula (PA-1) can be also appropriately selected. For example, a compound that is an ionic compound and has a proton acceptor site in the cation moiety may be used. More specifically, examples of such a compound include a com› pound represented by the following formula (7): 

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In the formula, A represents a sulfur atom or an iodine atom. 

m represents 1 or 2, and n represents 1 or 2, provided that when A is a sulfur atom, m+n=3 and when A is an iodine atom, m+n=2. 

R represents an aryl group. 

RN represents an aryl group substituted with a proton acceptor functional group. 

x- represents a counter anion. 

Specific examples of x- are the same as those of x- in formula (ZI). 

Specific preferred examples of the aryl group ofR and RN include a phenyl group. 

-continued 

