content_image/911130.jpg
[0258] The examples of group Y capable of leaving by the action of an acid include the groups represented by ----C(R 36 ) (R 37 )(R 38 ), ----C(=O)-O----C(R 36 )(R 37 )(R 33 ), ----C(R 0 i) (Ro2)(OR39), -C(Roi)(Ro2)----C(=O)----C-(R36)(R37) (R 38 ), and -CH(R 36 )(Ar). 

[0259] In the above formulae, each ofR 36 to R 39 indepen› dently represents an alkyl group, a cycloalkyl group, an aryl group, an aralkyl group, or an alkenyl group. R 36 and R 37 may be bonded to each other to form a ring structure. 

[0260] Each of Roi and R 02 independently represents a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group, an aralkyl group, or an alkenyl group. 

[0261] Ar represents an aryl group. 

[0262] The alkyl group represented by R 36 to R 39 , Roi or R 02 is preferably an alkyl group having 1 to 8 carbon atoms, for example, a methyl group, an ethyl group, a propyl group, an n-butyl group, a sec-butyl group, a hexyl group, and an octyl group, are exemplified. 

[0263] The cycloalkyl group represented by R 36 to R 39 , Roi or R 02 may be a monocyclic cycloalkyl group or may be a polycyclic cycloalkyl group. The monocyclic cycloalkyl group is preferably a cycloalkyl group having 3 to 8 carbon atoms and, for example, a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a cyclohexyl group and a cyclooctyl group are exemplified. The polycyclic cycloalkyl group is preferably a cycloalkyl group having 6 to 20 carbon atoms and, for example, an adamantyl group, a norbomyl group, an isoboronyl group, a camphanyl group, a dicyclo› pentyl group, an a-pine! group, a tricyclodecanyl group, a tetracyclododecyl group, and an androstanyl group are exem› plified. Incidentally, a part of the carbon atoms in the cycloalkyl group may be substituted with a heteroatom such as an oxygen atom and the like. 

[0264] The aryl group represented by R 36 to R 39 , Roi, R 02 or Ar is preferably an aryl group having 6 to 10 carbon atoms and, for example, a phenyl group, a naphthyl group, and an anthryl group are exemplified. 

[0265] The aralkyl group represented by R 36 to R 39 , Roi or R 02 is preferably an aralkyl group having 7 to 12 carbon atoms and, for example, a benzyl group, a phenethyl group, and a naphthylmethyl group are preferably exemplified. 

[0266] The alkenyl group represented by R 36 to R 39 , Roi or R 02 is preferably an alkenyl group having 2 to 8 carbon atoms and, for example, a vinyl group, an ally! group, a butenyl group, and a cyclohexenyl group are exemplified. 

[0267] The ring which can be formed by bonding R 36 to R 37 to each other may be monocyclic or polycyclic. As the mono› cyclic ring, a cycloalkane structure having 3 to 8 carbon atoms is preferred and, for example, a cyclopropane structure, a cyclobutane structure, a cyclopentane structure, a cyclohex› ane structure, a cycloheptane structure, and a cyclooctane structure are exemplified. As the polycyclic ring, a cycloal› kane structure having 6 to 20 carbon atoms is preferred and, for example, an adamantane structure, a norbomane struc› ture, a dicyclopentane structure, a tricyclodecane structure, and a tetracyclododecane structure are exemplified. Inciden› tally, a part of the carbon atoms in the structure may be substituted with a heteroatom such as an oxygen atom and the like. 

[0268] The above each group may have a substituent. The examples of the substituents include, for example, an alkyl 

group, a cycloalkyl group, an aryl group, an amino group, an amido group, a ureido group, a urethane group, a hydroxyl group, a carboxyl group, a halogen atom, an alkoxy group, a thioether group, an acyl group, an acyloxy group, an alkoxy› carbonyl group, a cyano group, and a nitro group. These substituents preferably have 8 or less carbon atoms. 

[0269] As group Y capable of leaving by the action of an acid, the structure represented by the following formula ( c) is more preferred. 

<img src='content_image/911130.jpg'>

[0270] In formula (c), R $^{4}$i represents a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group, or an aralkyl group. 

[0271] M $^{4}$i represents a single bond or a divalent linking group. 

[0272] Q represents an alkyl group, an alicyclic group which may contain a heteroatom, or an aromatic cyclic group which may contain a heteroatom. 

[0273] Incidentally, at least two ofR $^{4}$i, M$^{4}$i and Q may be bonded to each other to form a ring, and the ring is preferably a 5- or 6-membered ring. 

[0274] The alkyl group as R $^{4}$i is, for example, an alkyl group having 1 to 8 carbon atoms, and preferably a methyl group, an ethyl group, a propyl group, an isopropyl group, an n-butyl group, a sec-butyl group, a tert-butyl group, a hexyl group, and an octyl group are exemplified as the examples thereof. 

[0275] The alkyl group as R $^{4}$i may have a substituent and, for example, a cyano group, a halogen atom, a hydroxyl group, an alkoxy group, a carboxyl group, an alkoxycarbonyl group, and a cycloalkyl group are exemplified as the examples thereof 

[0276] The cycloalkyl group as R $^{4}$i is, for example, a cycloalkyl group having 3 to 15 carbon atoms, and preferably a cyclohexyl group, a norbornyl group, and an adamantyl group are exemplified as the examples thereof. 

[0277] The aryl group as R $^{4}$i is, for example, an aryl group having 6 to 15 carbon atoms, and preferably a phenyl group, a tolyl group, a naphthyl group, and an anthryl group are exemplified as the examples thereof. 

[0278] The aralkyl group as R $^{4}$i is, for example, an aralkyl group having 6 to 20 carbon atoms, and preferably a benzyl group and a phenethyl group are exemplified as the examples thereof. 

[0279] R $^{4}$i is preferably a hydrogen atom, a methyl group, an isopropyl group, a tert-butyl group, a cyclohexyl group, an adamantyl group, a phenyl group, or a benzyl group, and more preferably a methyl group or an adamantyl group. 

[0280] The divalent linking group as M $^{4}$i is, for example, an alkylene group (preferably an alkylene group having 1 to 8 carbon atoms, e.g., a methylene group, an ethylene group, a propylene group, a butylene group, a hexylene group, or an octylene group), a cycloalkylene group (preferably a cycloalkylene group having 3 to 15 carbon atoms, e.g., a cyclopentylene group or a cyclohexylene group), -S-, ---0-, -CO-, -CS-, -SO 2 -, -N(Ro )-, or a group formed by combining two or more of these groups, and the total carbon atom number is preferably 20 or less. Here, Ro is 

