content_image/906704.jpg content_image/906705.jpg content_image/906703.jpg
so that a hydroxyl radical, cyano radical, carbonyl radical, ether bond, ester bond, sulfonic acid ester bond, carbonate bond, lactone ring, sultone ring, carboxylic acid anhydride, or haloalkyl radical may form or intervene. 

[0063] Exemplary of the structure of the anion moiety in formula (6a) are the anion moieties described in JP-A 2014-177407, paragraphs [0100] to [0101]. 

[0064] In formula (6b ), examples of the divalent hydro› carbon group represented by L" include linear alkane diyl groups such as methylene, ethylene, propane-1,3-diyl, butane-1,4-diyl, pentane-1,5-diyl, hexane-1,6-diyl, heptane- 1,7-diyl, octane-1,8-diyl, nonane-1,9-diyl, decane-1,1O-diyl, undecane-1,11-diyl, dodecane-1,12-diyl, tridecane-1,13- diyl, tetradecane-1, 14-diyl, pentadecane-1, 15-diyl, hexade› cane-1, 16-diy 1, heptadecane-1, 17 -diy 1; saturated cyclic hydrocarbon groups such as cyclopentanediyl, cyclo› hexanediyl, norbomanediyl, and adamantanediyl; and unsaturated cyclic hydrocarbon groups such as phenylene and naphthylene. Also included are the foregoing groups in which at least one hydrogen atom is replaced by an alkyl group such as methyl, ethyl, propyl, n-butyl or tert-butyl. Alternatively, in the foregoing groups, a heteroatom such as oxygen, sulfur or nitrogen intervenes between carbon atoms, so that a hydroxyl radical, cyano radical, carbonyl radical, ether bond, ester bond, sulfonic acid ester bond, carbonate bond, lactone ring, sultone ring, carboxylic acid anhydride or haloalkyl radical may form. 

[0065] In formula (6b ), examples of the alkyl, alkenyl and aryl groups represented by R 11 , R 12 and R 13 include methyl, ethyl, propyl, isopropyl, n-butyl, sec-butyl, tert-butyl, tert› pentyl, n-pentyl, n-hexyl, n-octyl, cyclopentyl, cyclohexyl, 2-ethylhexyl, cyclopentylmethyl, cyclopentylethyl, cyclo› hexylmethyl, cyclohexylethyl, norbornyl, oxanorbomyl, tri› cyclo[5.2.l.O2•6]decanyl, adamantyl, phenyl and naphthyl. Also included are the foregoing groups in which at least one hydrogen atom is replaced by a heteroatom such as oxygen, sulfur, nitrogen or halogen, or in which a heteroatom such as oxygen, sulfur or nitrogen intervenes between carbon atoms, so that a hydroxyl radical, cyano radical, carbonyl radical, ether bond, ester bond, sulfonic acid ester bond, carbonate bond, lactone ring, sultone ring, carboxylic acid anhydride, or haloalkyl radical may form or intervene. Inter alia, optionally substituted arylene groups are preferred. Any two or more ofR 11 , R 12 andR 13 may bond together to form a ring with the sulfur atom. Examples of the ring structure are shown below. 

<img src='content_image/906704.jpg'>

<img src='content_image/906705.jpg'>

Herein R 600 is a monovalent hydrocarbon group as defined and exemplified for R 11 , $_{R }$12 and R 13 . 

[0066] Exemplary structures of the sulfonium cation hav› ing formula (6b) are shown below, but not limited thereto. 

<img src='content_image/906703.jpg'>

-continued 

