Patent ID: 8168816

Claim:
A method for producing a purified formylcyclopropane compound represented by the formula (1) comprising (A) a step of reacting a crude formylcyclopropane compound represented by the formula (1): wherein R 1 represents an alkyl group which may be substituted with at least one selected from a group consisting of a halogen atom, a C1-C3 alkoxy group and a C6-C10 aryloxy group; an aryl group which may be substituted with at least one selected from a group consisting of a halogen atom, a C1-C3 alkoxy group and a C6-C 10 aryloxy group; a heteroaryl group which may be substituted with at least one selected from a group consisting of a halogen atom, a C1-C3 alkoxy group and a C6-C 10 aryloxy group; or an aralkyl group which may be substituted with at least one selected from a group consisting of a halogen atom, a C1-C3 alkoxy group and a C6-C10 aryloxy group, with an alkali metal hydrogen sulfite to obtain an alkali metal hydroxymethanesulfonate represented by the formula (2): wherein R 1 represents the same meaning as defined above and M represents an alkali metal, and (B) a step of reacting a base with the alkali metal hydroxymethanesulfonate represented by the formula (2) obtained in the above-mentioned step (A) in a range of pH 9 to 11 to obtain a purified formylcyclopropane compound represented by the formula (1).