Patent ID: 8013171

Claim:
An optically active compound represented by the following general formula (4′): wherein, R 1 and R 2 may be the same or different and are hydrogen atom, an alkali metal, or an alkyl group optionally having a substituent selected from the group consisting of alkoxy groups and halogen atoms; R 11 is hydrogen atom, an alkyl group optionally having a substituent selected from the group consisting of alkoxy groups and halogen atoms, a cycloalkyl group optionally having a substituent selected from the group consisting of alkoxy groups and halogen atoms, or an aryl group optionally having a substituent selected from the group consisting of linear or branched alkyl groups having 1 to 6 carbon atoms, linear or branched alkoxy groups having 1 to 6 carbon atoms and halogen atoms; R 12′ is an alkyl group optionally having a substituent selected from the group consisting of alkoxy groups and halogen atoms, a cycloalkyl group optionally having a substituent selected from the group consisting of alkoxy groups and halogen atoms, or an aryl group optionally having a substituent selected from the group consisting of linear or branched alkyl groups having 1 to 6 carbon atoms, linear or branched alkoxy groups having 1 to 6 carbon atoms and halogen atoms; Z 1 is an oxygen, a sulfur atom, a methylene chain, NR N (wherein R N is alkyl, aryl, alkanesulfonyl, arylsulfonyl, or acyl group) or Si(R Si ) 2 (wherein R Si is an alkyl or aryl group or may form a ring as Si(R Si ) 2 ; two R 12′ may form a ring optionally having a substituent selected from the group consisting alkyl groups, alkoxy groups and halogen atoms, or a methylene chain optionally having a substituent selected from the group consisting of alkyl groups having 1 to 4 carbon atoms, alkoxy groups having 1 to 4 carbon atoms, alkoxycarbonyl groups having an alkoxy group having 1 to 4 carbon atoms and halogen atoms and optionally having oxygen atom or sulfur atom in the chain, in combination with each other; and * is axial asymmetry.