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Examples of Y 2 of the group leaving by the action of an acid include -C(R 36 )(R 37 )(R 38 ), ----C(=O)-O----C(R 36 ) (R37)(R3s), ----C(Roi)(Ro2)(OR39), ----C(Roi)(Ro2)----C (=O)-O----C(R 36 )(R 37 )(R 38 ), ----CH(R 36 )(Ar), and the like. 

In the formulae, R 36 to R 39 each independently represent an alkyl group, a cycloalkyl group, a monovalent aromatic ring group, a group formed by a combination of an alkylene group and a monovalent aromatic ring group, or an alkenyl group. R 36 and R 37 may be bonded to each other to form a ring. 

Roi and R 02 each independently represent a hydrogen atom, an alkyl group, a cycloalkyl group, a monovalent aromatic ring group, a group formed by a combination of an alkylene group and a monovalent aromatic ring group, or an alkenyl group. 

Ar represents a monovalent aromatic ring group. 

An alkyl group in R 36 to R 39 , Roi and R 02 is preferably an alkyl group having 1 to 8 carbon atoms and, for example, a methyl group, an ethyl group, a propyl group, an n-butyl group, a sec-butyl group, a hexyl group, an octyl group, and the like are included. 

A cycloalkyl group in R 36 to R 39 , R 0 i and R 02 may be a monocyclic type or polycyclic type. As a monocyclic type, a cycloalkyl group having 3 to 8 carbon atoms is preferable and, for example, a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, a cyclooctyl group, and the like are included. As a polycyclic type, a cycloalkyl group having 6 to 20 carbon atoms is preferable and, for example, an adamantyl group, a norbornyl group, an isobor› nyl group, a camphanyl group, a dicyclopentyl group, an a-pinanyl group, a tricyclodecanyl group, a tetracyclodode› cyl group, an androstanyl group, and the like are included. Incidentally, parts of carbon atoms in the cycloalkyl group may be substituted with a heteroatom such as an oxygen atom. 

A monovalent aromatic ring group ofR 36 to R 39 , R 0 i, R 02 and Ar is preferably a monovalent aromatic ring group having 6 to 10 carbon atoms and, for example, an aryl group such as a phenyl group, a naphthyl group or anthryl group and a divalent aromatic ring group including a hetero ring such as thiophene, furan, pyrrole, benzothiophene, benzo› furan, benzopyrrole, triazine, imidazole, benzoimidazole, triazole, thiadiazole or thiazole is included. 

As a group formed by a combination of an alkylene group and a monovalent aromatic ring group ofR 36 to R 39 , Roi and R 02 , an aralkyl group having 7 to 12 carbon atoms is preferable and, for example, a benzyl group, a phenethyl group, a naphthylmethyl group, and the like are included. 

An alkenyl group in R 36 to R 39 , Roi and 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, a cyclohexenyl group, and the like are included. 

A ring in which R 36 and R 37 are bonded to each other to form may be a monocyclic type or polycyclic type. As a monocyclic type, a cycloalky I structure having 3 to 8 carbon atoms is preferable and, for example, a cyclopropane struc› ture, a cyclobutane structure, a cyclopentane structure, a cyclohexane structure, a cycloheptane structure, a cyclooc› tane structure, and the like and included. As a polycyclic type, a cycloalkyl structure having 6 to 20 carbon atoms is preferable and, for example, an adamantane structure, a norbornane structure, a dicyclopentane structure, a tricyclo› decane structure, a tetracyclododecane structure, and the like are included. Incidentally, parts of carbon atoms in the cycloalkyl structure may be substituted with a heteroatom such as an oxygen atom. 

The respective groups described above as R 36 to R 39 , Roi, Ra$_{2 }$ and Ar may have a substituent, and examples of the substituent include 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 alkoxycarbonyl group, a cyano group, a nitro group, and the like and the number of carbon atoms of the substituent is preferably 8 or less. 

As Y 2 of the group leaving by the action of an acid, a structure represented by the following general formula (VI› A) is more preferable. 

lO [Chem. 38] 

Here, Li and L 2 each independently represent a hydrogen atom, an alkyl group, a cycloalkyl group, a monovalent aromatic ring group or a group formed by a combination of an alkylene group and a monovalent aromatic ring group; 

M represents a single bond or a divalent connecting group; and 

Q represents an alkyl group, a cycloalkyl group which may include a heteroatom, a monovalent aromatic ring group which may include a heteroatom, an amino group, an ammonium group, a mercapto group, a cyano group or an aldehyde group. 

At least two of Q, M, Li may be bonded to form a ring (preferably a 5-membered or a 6-membered ring). 

An alkyl group as Li and L 2 , for example, is an alkyl group having 1 to 8 carbon atoms, and specifically, 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 preferably included. 

A cycloalkyl group as Li and L 2 , for example, is a cycloalkyl group having 3 to 15 carbon atoms, and specifi› cally, a cyclopentyl group, a cyclohexyl group, a norbornyl group, an adamantyl group, and the like are included as a preferable example. 

A monovalent aromatic ring group as Li and L 2 , for example, is an aryl group having 6 to 15 carbon atoms, and specifically, a phenyl group, a tolyl group, a naphthyl group, an anthryl group, and the like are included as a preferable example. 

A group formed by a combination of an alkylene group and a monovalent aromatic ring group as Li and L 2 , for example, is a group having 6 to 20 carbon atoms, and an aralkyl group such as a benzyl group or a phenethyl group is included. 

A divalent linking group as M, for example, is an alkylene group (for example, a methylene group, an ethylene group, a propylene group, a butylene group, a hexylene group, an octylene group, or the like), a cycloalkylene group (for example, a cyclopentylene group, a cyclohexylene group, an adamantylene group, or the like), an alkenylene group (for example, a vinylene group, a propenylene group, a bute› nylene group, or the like), a divalent aromatic ring group (for example, a phenylene group, a tolylene group, a naphthylene group, or the like), -S-, ---0-, -CO-, -SO2-, -N(R 0 )- and a divalent linking group formed by a com› bination of a plurality of these groups. R 0 is a hydrogen atom or an alky group (for example, it is an alkyl group having 1 to 8 carbon atoms, and specifically, a methyl group, an ethyl group, a propyl group, an n-butyl group, a sec-butyl group, a hexyl group, an octyl group, or the like). An alkyl group as Q is the same as each group as Li and L 2 described above. 

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(VI-A) 

