Chiral discrimination of the enantiomers of racemic α-alkenes in polymerization with highly active MgCl2-supported Ziegler-Natta catalysts is observed when (–)-menthyl benzoate is used as internal Lewis base; using (–)-menthyl benzoate as an external Lewis base leads to opposite but lower stereoelectivity.
F. Ciardelli, C. Carlini, A. Altomare and F. Menconi, J. Chem. Soc., Chem. Commun., 1987, 94 DOI: 10.1039/C39870000094
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