A dramatic reversal in the direction of enantiofacial differentiation has been observed in a chiral phosphine mediated reaction of organocuprate with chalcone providing S- and R-products in diethyl ether and tetrahydrofuran (THF), respectively, and correlated with the pattern of coordination.
M. Kanai, K. Koga and K. Tomioka, J. Chem. Soc., Chem. Commun., 1993, 1248 DOI: 10.1039/C39930001248
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