Abstract: Three kinds of optically active ligands were combined with copper(Ⅰ)-acetate to give 8 chiral copper complexes:d-camphor-10-sulfonic acid and its derivatives of Schiff base, hydroxypinocamphone and its derivatives of Schiff base,and bis-oxazoline. The optical yields of 2,2-diphenylcyclopropanecarboxylic ethyl ester were 5%～50e.e.. The reaction of diphenylethylene or isobutylene with menthyl diazoaceteta by chiral copper(Ⅰ) bis-oxazo-line gave an enantioselectivity of 81.5%e.e. and 95%e.e., respectively.

Key words: diazoacetate, diphenyl ethylene, isobutylene, cyclopropanation, camphorsulfonicacid, hydroxypinocamphone, bisoxazoline, chiral copper complex