The 1,4-conjugate addition of diethylzinc to cyclohex-2-enone and cyclopent-2-enone catalyzed by a copper complex of a chiral aryl diphosphite gave the desired products with 90.2 and 76.6% ee respectively.
M. Yan, L. Yang, K. Wong and A. S. C. Chan, Chem. Commun., 1999, 11 DOI: 10.1039/A807997H
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