Mar. 26, 2015  7  US 2015/0086912 Al  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.  [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.  [0108]  It is preferred that at least one ofR 1 a to R 13 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.  [0109]  When each ofR 1 a to R 13 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  [0118]  Contiguous two of R  la  to R  13$_{a }$ 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  [0117]  Further, when each of R  la  to R  13$_{a }$ 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.  [0116]  When each ofR 1 a to R 13 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.  [0115]  When each ofR 1 a to R 13 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.  [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.  [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.  [0112]  When each of R  la  to R  13$_{a }$ 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.  [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.  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.  (ZA-1-lA)  Rlla  (ZA-1-lB) 