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In the formulas (ca-14) and (ca-15), u is an integer of 1 to 3, and most preferably 1 or 2. 

R $^{9 }$represents a phenyl group, a naphthyl group or an alkyl group which may have a substituent. 

Further, examples of the substituent for the phenyl group or naphthyl group represented by R $^{9 }$include the same groups as those described above for substituents which the substituted aryl group represented by R 1 " to R 3 " may have. Specific examples thereof include an alkyl group, an alkoxy group, a halogen atom, a halogenated alkyl group, a hydroxy group, an oxo group (=0), a cyano group, an aryl group, an alkoxy› alkyloxy group, an alkoxycarbonylalkyloxy group, -C(=0)---0-R 6 ’, -0----C(=0)-R 7 ’, ---O-R 8 -0-R 9 ’, a halogenated alkylsulfonyoxy group and -0-Ql-[0-Rll11_s+(R2111)(R3111)lx• 9 

As the alkyl group which may have a substituent for R , the same alkyl group which may have a substituent as those described above for R 1 " to R 3 ". 

R $^{10 }$represents a phenyl group, a naphthyl group, an alkyl group and an alkoxy group which may have a substituent. 

-continued 

Examples of the substituent for the phenyl group or naph› thyl group represented by R$^{10 }$include the same groups as those described above for substituents which the phenyl group or naphthyl group represented by R $^{9 }$may have. 

As the alkyl group in the alkyl group and alkoxy group which may have a substituent for R 10 , the same alkyl group as those described above for R 1 " to R 3 " can be mentioned. 4 

As the alkylene group for R ’, a linear or branched alkylene group is preferable. The alkylene group preferably has 1 to 12 carbon atoms, more preferably 1 to 5 carbon atoms, and most preferably 1 to 3 carbon atoms. 

Further, examples of the substituent which the alkylene group represented by R 4 ’ may have include the same groups as those described above for substituents which the substi› tuted alkyl group represented by R 1 " to R 3 " may have. Spe› cific examples thereof include an alkoxy group, a halogen atom, a halogenated alkyl group, a hydroxy group, an oxo group (=0), acyano group, anaryl group, analkoxyalkyloxy group, an alkoxycarbonylalkyloxy group, -C(=0)-0- R 6’, -0----C(=0)-R 7 ’, ---O-R 8 ’, ---O-R 9 ’, a haloge› nated alkylsulfonyoxy group and ---O-Q 1 -[0-R $^{11}$"-S+ (R21")(R31")lx• 

Preferable examples of the cation represented by the for› mula (ca-14) or (ca-15) are shown below. 

[Chemical Formula 63] 

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