Patent ID: 7671210

Claim:
An asymmetric copper complex obtained by mixing (A) at least one monovalent or divalent copper compound, (B) at least one optically active bisoxazoline compound represented by the formula (1): wherein R 1 and R 2 are the same or different, and independently represent a hydrogen atom; a C1-C6 alkyl group; a phenyl group which is optionally substituted with a C1-C6 alkyl group or groups, or a C1-C6 alkoxy group or groups; or a C7-C12 aralkyl group which is optionally substituted with a C1-C6 alkoxy group or groups, or R 1 and R 2 are bonded together to represent a C2-C6 polymethylene group, R 3 represents a methyl group; an isopropyl group; an isobutyl group; a tert-butyl group; a 1-naphthyl group; a 2-naphthyl group; a phenyl group which is optionally substituted with a C1-C6 alkyl group or groups, or a C1-C6 alkoxy group or groups; or a C7-C12 aralkyl group which is optionally substituted with a C1-C6 alkoxy group or groups, and R 4 and R 5 are the same and represent hydrogen atoms or C1-C3 alkyl groups, or R 4 and R 5 are bonded together to represent a C2-C5 polymethylene group, and (C) at least one boron compound represented by the formula (2): wherein A represents a lithium atom, a sodium atom, a potassium atom, a silver atom or a trityl group, X represents a fluorine atom or a fluorine-substituted C1-C8 alkyl group, and n represents an integer of 1 to 5.