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alkyl group for R’, the same alkyl groups, alkoxy groups, halogen atoms, halogenated alkyl groups, --COOR", -DC (=O)R" (R" is the same as defined above) andhydroxyalkyl groups as those described above as the substituent for the -SO$_{2}$ - containing cyclic group can be mentioned. 

As the alkyl group for R’, an alkyl group of 1 to 5 carbon atoms is preferable, and examples thereof include a methyl group, an ethyl group, a propyl group, an n-butyl group and a tert-butyl group. 

As the alkoxy group for R’, an alkoxy group ofl to 5 carbon atoms is preferable, and examples thereof include a methoxy group, an ethoxy group, an n-propoxy group, an iso-propoxy group, an n-butoxy group and a tert-butoxy group 

In terms of industrial availability, R’ is preferably a hydro- gen atom. 

The alkyl group for R" may be any of linear, branched or cyclic. 

When R" is a linear or branched alkyl group, it preferably has 1 to 10 carbon atoms, more preferably 1 to 5 carbon atoms. 

When R" is a cyclic alkyl group ( cycloalkyl group), it preferably has 3 to 15 carbon atoms, more preferably 4 to 12 carbon atoms, and most preferably 5 to 10 carbon atoms. As examples of the cycloalkyl group, groups in which one or more hydrogen atoms have been removed from a monocy- cloalkane or a polycycloalkane such as a bicycloalkane, tri- cycloalkane or tetracycloalkane, which may or may not be substituted with a fluorine atom or a fluorinated alkyl group, may be used. Examples of such groups include groups in which one or more hydrogen atoms have been removed from a monocycloalkane such as cyclopentane or cyclohexane; and groups in which one or more hydrogen atoms have been removed from a polycycloalkane such as adamantane, nor- bomane, isobornane, tricyclodecane or tetracyclododecane. 

As examples of A", the same groups as those described above for A’ in general formula (3-1) can be given. A" is preferably an alkylene group of 1 to 5 carbon atoms, an oxygen atom (-0-) or a sulfur atom (-S-), and more preferably an alkylene group ofl to 5 carbon atoms or---0-. As the alkylene group of 1 to 5 carbon atoms, a methylene group or a dimethylethylene group is preferable, and a meth- ylene group is particularly desirable. 

R $^{29 }$is the same as defined for R$^{29 }$in the aforementioned general formula (a2-0). 

In formula (a2-1), s" is preferably 1 or 2. 

Specific examples of structural units represented by gen- era! formulas (a2-1) to (a2-5) are shown below. In the formu- las shown below, R"’ represents a hydrogen atom, a methyl group or a trifluoromethyl group. 

[Chemical Formula 64] 

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