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The term "-SO$_{2}$--containing cyclic group" refers to a cyclic group containing a ring containing -SO$_{2}$ - in a ring skeleton thereof, and specifically, it is a cyclic group in which the sulfur atom (S) in -SO$_{2}$ - forms a part of the ring skeleton of the cyclic group. When the ring containing -SO$_{2}$ - in the ring skeleton thereof is counted as the first ring, an -SO$_{2}$--containing cyclic group in which the only ring structure is the -SO$_{2}$--containing ring is called a monocyclic group, whereas an -SO$_{2}$--containing cyclic group containing other ring structure is called a polycyclic group regardless of the structure of the other rings. The -SO$_{2}$--containing cyclic group may be either a monocy› clic group or a polycyclic group. 

The -SO$_{2}$--containing cyclic group is especially prefer› ably a cyclic group containing---O-SO$_{2}$-in a ring skeleton thereof, namely a cyclic group containing a sultone ring in which -O-S- in ---O-SO$_{2}$ - forms a part of the ring skeleton. 

More specifically, examples of the -SO$_{2}$--containing cyclic group include groups represented by the following general formulae (a5-r-1) to (a5-r-4), respectively. 

[Chemical formula 3 7] 

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In the formulae, each Ra’ 15 independently represents a 65 hydrogen atom, an alkyl group, an alkoxy group, a halogen atom, a halogenated alkyl group, a hydroxyl group, 

-continued 

--COOR", ---OC(=O)R", ahydroxyalkyl group, or a cyano group; R" represents a hydrogen atom, an alkyl group, a lactone-containing cyclic group, a carbonate-containing cyclic group, or a -SO$_{2}$--containing cyclic group; A" rep- resents an alkylene group having 1 to 5 carbon atoms, which may contain an oxygen atom or a sulfur atom, an oxygen atom, or a sulfur atom; and n’ represents an integer of0 to 2. 

In the general formulae (a5-r-1) to (a5-r-4), A" is the same as A" in the general formulae (a2-r-2), (a2-r-3), and (a2-r-5). 

The alkyl group, the alkoxy group, the halogen atom, the halogenated alkyl group, --COOR", ---OC(=O)R", and the hydroxyalkyl group in Ra’$^{51 }$are the same as those exemplified in the description ofRa’$^{21 }$in the general formulae (a2-r-1) to (a2-r-7). 

Specific examples of each of the groups represented by the general formulae (a5-r-1) to (a5-r-4) are given below. In the following formulae, "Ac" represents an acetyl group. 

[Chemical formula 38] 

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