A process for producing a monomer for resists represented by the following general formula 1:
1
wherein R
1
represents hydrogen or an optionally substituted alkyl group; R
2
, R
3
and R
4
each independently represent hydrogen or a substituent; and X, Y and Z each independently represent a direct bond or an optionally substituted alkylene group with 1 to 3 chain members,
the process comprising carrying out esterification or transesterification in the presence of a biocatalyst.