Patent ID: 8269038

Claim:
A method for producing a sulfonate ester compound represented by formula (11): R 4 —SO 2 —OR 5 (11), wherein R 4 represents (i) a C 1-12 alkyl group optionally having one sulfo group or —SO 2 —OR 5 as a substituent, (ii) a C 2-12 alkenyl group, or (iii) an aryl group optionally having a substituent selected from the group consisting of an amino group optionally substituted by a phenoxycarbonyl group and a C 1-2 alkyl group, where said aryl group is a group selected from the group consisting of a phenyl group, a naphthyl group, a phenanthryl group, and an anthryl group, and R 5 represents a C 1-12 alkyl group optionally having a group represented by formula (1): —OR 1 (1), wherein R 1 represents sulfonyl group represented by formula (2) as a substituent: —SO 2 —R 2 (2), wherein R 2 represents a halogen atom, a C 1-12 fluoroalkyl group, or a C 1-12 alkoxy group, and the R 4 and the R 5 optionally form a group represented by a following formula: -T 1 -SO 2 —O-T 2 -, wherein T 1 and T 2 represent each independently a C 1-8 alkylene chain, where the T 1 binds to an adjacent S atom and the T 2 binds to an adjacent O atom, so as to form a ring, the method comprising: reacting (a) a compound having a sulfo group (—SO 3 H), which is capable of forming a salt with an organic base, represented by formula (4): R 4 —SO 2 —OH (4), wherein the R 4 is as defined above, and (b) a compound represented by formula (5): R 5 —O—R 1 (5), wherein the R 1 represents a sulfonyl group represented by formula (2) as defined above, and the R 5 is as defined above, in the presence of an organic base, which is capable of forming a salt with said sulfo group.