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In addition, the foregoing formula (L4-4) is to represent one kind or a mixture of two or more kinds selected from groups represented the following general formulae (L4-4-1) to (L4-4-4 ). 

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The foregoing general formulae (L4-1) to (L4-4 ), (L4-3- l ), (L4-3-2), and (L4-4-1) to (L4-4-4) are to also represent all of these enantiomers and a mixture of the enantiomers. 

Meanwhile, a high reactivity in the acid-catalyzed elimi› nation reaction is realized when each of the bonding direc- tions of(L4-1) to (L4-4), (L4-3-l), (L4-3-2), and (L4-4-1) to (L4-4-4) is to the exo-position of the bicyclo[2.2.1 ]heptane ring (see Japanese Patent Laid-Open (kokai) No. 2000- 336121). In the preparation of a monomer containing a ter- tiary exo-alkyl group having these bicyclo[2.2.l]hepatane skeletons as a substituent, there is a case to include a mono› mer that is substituted with an endo-alkyl group represented by the following general formulae (L4-1-endo) to (L4-4- endo ). In such a case, to accomplish a good reactivity, the exo-ratio is preferably 50% or more by mole, or more pref› erably 80% or more by mole. 

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(See Japanese Patent Laid-Open (kokai) No. 2000- 336121.) 

As the acid-labile group of the foregoing formula (L4), specifically the following groups are exemplified. 

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In addition, as a tertiary alkyl group having 4 to 20 carbon atoms, a trialkylsilyl group whose each alkyl group has 1 to 6 

