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phenylthio group. The substituents are preferably a linear or branched alky I group having 1 to 12 carbon atoms, a monova› lent aliphatic hydrocarbon cyclic group having 3 to 12 carbon atoms (preferably a cycloalkyl group having 3 to 12 carbon atoms), and a linear, branched or cyclic alkoxy group having 1 to 12 carbon atoms, and more preferably an alkyl group having 1 to 4 carbon atoms, and an alkoxy group having 1 to 4 carbon atoms. The substituent may be substituted on any oneofthreeR$_{201 }$to R$_{203}$, or maybe substituted on all of three. Further, when R$_{201 }$to R$_{203 }$is an aryl group, it is preferred that the substituent is substituted on the p-position of the aryl group. 

[0104] As more preferred groups represented by formula (ZA-1-1), triarylsulfonium and the structure represented by the following formula (ZA-1-lA) or (ZA-1-18) are exempli› fied. 

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[0105] In formula (ZA-1-lA), each ofR 1 a to R 13 a indepen› dently represents a hydrogen atom or a substituent. 

[0106] Za represents a single bond or a divalent linking group. 

[0107] The alcoholic hydroxyl group in the invention means a hydroxyl group bonded to the carbon atom of a chain-like or cyclic alkyl group. 1 13 

[0108] It is preferred that at least one ofR a to R a repre› sents a substituent containing an alcoholic hydroxyl group, and more preferably at least one of R 9 a to R 13$_{a }$ contains an alcoholic hydroxyl group. 1 13 

[0109] When each ofR a to R a represents a substituent containing an alcoholic hydroxyl group, each ofR la to R $^{13$_{a }$}$is represented by -W-Y, provided that Y is a chain-like or cyclic alkyl group substituted with a hydroxyl group, and W is a single bond or a divalent linking group. 

[0110] The examples ofthechain-likeorcyclic alkyl group ofY include a methyl group, an ethyl group, a propyl group, an isopropyl group, an n-butyl group, an isobutyl group, a sec-butyl group, a pentyl group, a neopentyl group, a hexyl group, a heptyl group, an octyl group, a nonyl group, a decyl group, a cyclopropyl group, a cyclopentyl group, a cyclo› hexyl group, an adamantyl group, a norbonyl group, and a barony! group, preferably an ethyl group, a propyl group, an 

isopropyl group, an n-butyl group, an isobutyl group, and a sec-butyl group, and more preferably an ethyl group, a propyl group, and an isopropyl group. Especially preferably Y con› tains a ----CH$_{2}$CH$_{2}$OH structure. 

[0111] W preferably represents a single bond, or a divalent group obtained by substituting a single bond for an arbitrary hydrogen atom of an alkoxy group, an acyloxy group, an acylamino group, an alkylsulfonylamino group, an arylsulfo› nylamino group, an alkylthio group, an alkylsulfonyl group, an acyl group, an alkoxycarbonyl group, or a carbamoyl group, and more preferably represents a single bond, or a divalent group obtained by substituting a single bond for an arbitrary hydrogen atom of an acyloxy group, an alkylsulfo› nyl group, an acyl group, or an alkoxycarbonyl group. 13$_{a }$ 

[0112] When each of R la to R represents a substituent containing an alcoholic hydroxyl group, the number of car› bon atoms contained is preferably 2 to 10, more preferably 2 to 6, and especially preferably 2 to 4. 

[0113] The substituent containing an alcoholic hydroxyl group as R 1 a to R 13 a may contain two or more alcoholic hydroxyl groups. The number of the alcoholic hydroxyl groups in the substituent containing an alcoholic hydroxyl group as R 1 a to R 13 a is 1 to 6, preferably 1 to 3, and more preferably 1. 

[0114] The number of the alcoholic hydroxyl groups con› tained in the compound represented by formula (ZA-1-1 A) is preferably 1 to 10 in total ofR 1 a to R 13 a, more preferably 1 to 6, and still more preferably 1 to 3. 1 13 

[0115] When each ofR a to R a does not contain an alco› holic hydroxyl group, each of R la to R 13$_{a }$ preferably repre› sents a hydrogen atom, a halogen atom, an alkyl group, a monovalent aliphatic hydrocarbon cyclic group (preferably a cycloalkyl group), analkenyl group (including a cycloalkenyl group and a bicycloalkenyl group), an alkynyl group, an aryl group, a cyano group, a carboxyl group, an alkoxy group, an aryloxy group, an acyloxy group, a carbamoyloxy group, an acylamino group, an aminocarbonylamino group, an alkoxy› carbonylamino group, anaryloxycarbonylamino group, a sul› famoylamino group, an alkylsulfonylamino group, an aryl› sulfonylamino group, an alkylthio group, an arylthio group, a sulfamoyl group, an alkylsulfonyl group, an arylsulfonyl group, an aryloxycarbonyl group, an alkoxycarbonyl group, a carbamoyl group, an imido group, a silyl group, or a ureido group. 1 13 

[0116] When each ofR a to R a does not contain an alco› holic hydroxyl group, each of R 1 a to R 13 a more preferably represents a hydrogen atom, a halogen atom, an alkyl group, a monovalent aliphatic hydrocarbon cyclic group (preferably a cycloalkyl group), a cyano group, an alkoxy group, an acyloxy group, an acylamino group, an aminocarbonylamino group, an alkoxycarbonylamino group, an alkylsulfony› lamino group, an arylsulfonylamino group, an alkylthio group, a sulfamoyl group, an alkylsulfonyl group, an arylsul› fonyl group, an alkoxycarbonyl group, or a carbamoyl group. 13$_{a }$ 

[0117] Further, when each of R la to R does not contain an alcoholic hydroxyl group, each of R la to R 13$_{a }$ especially preferably represents a hydrogen atom, an alkyl group, a monovalent aliphatic hydrocarbon cyclic group (preferably a cycloalkyl group), a halogen atom, or an alkoxy group. 13$_{a }$ 

[0118] Contiguous two of R la to R can also form a ring together ( e.g., aromatic or non-aromatic hydrocarbon rings or heterocyclic rings, and these rings may be combined to form polycyclic condensed rings, e.g., a benzene ring, a naphtha› lene ring, an anthracene ring, a phenanthrene ring, a fluorene 

