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[0300] The organic group not having a aromatic ring as R$_{201 }$to R$_{203 }$has generally 1 to 30 carbon atoms, and prefer› ably 1 to 20 carbon atoms. 

[0301] R$_{201 }$ to R$_{203 }$ are each independently preferably an alkyl group, a cycloalkyl group, an ally! group, or a vinyl group, more preferably a linear or branched 2-oxoalkyl group, a 2-oxocycloalkyl group, or an alkoxycarbonylmethyl group, and particularly preferably a linear or branched 2-oxoalkyl group. 

[0302] Preferred examples of the alkyl group and the cycloalkyl group ofR$_{201 }$to R$_{203 }$include a linear or branched alkyl group having 1 to 10 carbon atoms (for example, a methyl group, an ethyl group, a propyl group, a butyl group, and a penty I group), and a cycloalky I group having 3 to 10 carbon atoms (a cyclopentyl group, a cyclohexyl group, and a norbornyl group). 

[0303] R$_{201 }$to R$_{203 }$may be further substituted with a halo› gen atom, an alkoxy group (for example, having 1 to 5 carbon atoms), a hydroxyl group, a cyano group, and a nitro group. 

[0304] Next, the compound (ZI-3) will be described. 

[ 03 05] The compound (ZI-3) is a compound represented by the following General Formula (ZI-3), having a phenacylsul› fonium salt structure. 

<img src='content_image/945904.jpg'>

[0306] In General Formula (ZI-3), 

[0307] R$_{1}$c to R 5 c each independently represent a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group, an alkoxy group, an aryloxy group, an alkoxycarbonyl group, an alkylcarbonyloxy group, a cycloalkylcarbonyloxy group, a halogen atom, a hydroxyl group, a nitro group, an alkylthio group, or an arylthio group, 

[0308] R$_{6}$ c and R 7 c each independently represent a hydro› gen atom, an alkyl group, a cycloalkyl group, a halogen atom, a cyano group, or an aryl group, and 

[0309] Rx and RY each independently represent an alkyl group, a cycloalkyl group, a 2-oxoalkyl group, a 2-oxocy› cloalkyl group, an alkoxycarbonylalkyl group, an ally! group, or a vinyl group. 

[0310] Any two or more ofR$_{1}$ c to R 5 c, R 5 c and R 6 c, R 6 c and R$_{7}$c, R 5 c and Rx, or Rx and RY may be respectively bonded to each other to form a ring structure, and this ring structure may contain an oxygen atom, a sulfur atom, a ketone group, an ester bond, or an amide bond. 

[0311] Examples of the ring structure include an aromatic or non-aromatic hydrocarbon ring, an aromatic or non-aro› matic heterocycle, and a polycyclic fused ring formed by combination of two or more of these rings. Examples of the ring structure include 3- to 10-membered rings, with 4- to 8-membered rings being preferable, and 5- or 6-membered rings being more preferable. 

[0312] Examples of the group formed by combination of any two or more ofR$_{1}$c to R 5 c, a pair ofR 6 c and R 7 c, or a pair of Rx and RY include a butylene group, and a pentylene group. 

(ZI-3) 

[0313] The group formed by combination of a pair of R$_{5}$ c and R$_{6}$c, or a pair ofR 5 c and Rx is preferably a single bond or an alkylene group, and examples of the alkylene group include a methylene group and an ethylene group. 

[0314] zc- represents a non-nucleophilic anion, and examples thereof include the same ones as the non-nucleo› philic anions of z- in General Formula (ZI). 

[0315] Specific examples of the alkoxy group in the alkoxy› carbonyl group as R$_{1}$c to R 5 c are the same as the specific examples of the alkoxy group as R$_{1}$ c to R 5 c above. 

[0316] Specific examples of the alkyl group in the alkylcar› bonyloxy group and the alkylthio group as R$_{1}$ c to R 5 c are the same as the specific examples of the alkyl group as R$_{1}$c to R 5 c above. 

[0317] Specific examples of the cycloalkyl group in the cycloalkylcarbonyloxy group as R$_{1}$ c to R 5 c are the same as the specific examples of the cycloalkyl group as R$_{1}$ c to R 5 c above. 

[0318] Specific examples of the aryl group in the aryloxy group and the arylthio group as R$_{1}$c to R 5 c are the same as the specific examples of the aryl group as R$_{1 }$c to Rx above. 

[0319] Examples of the cation in the compound (ZI-2) or (ZI-3) in the present invention including the cations described after paragraph "0036" in the specification of US2012/ 0076996Al. 

[0320] Next, the compound (ZI-4) will be described. 

[0321] The compound (ZI-4) is represented by the follow› ing General Formula (ZI-4). 

<img src='content_image/945905.jpg'>

[0322] In General Formula (ZI-4), 

[0323] R$_{13 }$represents a hydrogen atom, a fluorine atom, a hydroxyl group, an alkyl group, a cycloalkyl group, an alkoxy group, an alkoxycarbonyl group, or a group having a cycloalkyl group, and these groups may have a substituent, in the case where R 14 ’ s are present in plural numbers, they each independently represent a hydroxyl group, an alkyl group, a cycloalkyl group, an alkoxy group, an alkoxycarbonyl group, an alky lcarbony I group, an alky lsulfony I group, a cycloalkyl› sulfony l group, or a group having a cycloalkyl group, and these groups may have a substituent, 

[0324] R$_{15}$’s each independently represent an alkyl group, a cycloalkyl group, or a naphthyl group, these groups may have a substituent, two R$_{15}$’s may be bonded to each other to form a ring, and when two R$_{15}$’s are bonded to each other to form a ring, the ring skeleton may contain a hetero atom such as an oxygen atom and a nitrogen atom; and in an aspect, two R$_{15 }$’s are alkylene groups, and are preferably bonded to each other to form a ring structure, 

[0325] I represents an integer ofO to 2, 

[0326] r represents an integer of Oto 8, and 

[0327] z- represents a non-nucleophilic anion, and examples thereof include the same ones as the nucleophilic anions of z- in General Formula (ZI). 

(Zl-4) 

