Diethylzinc adds to N-diphenylphosphinoylimines highly enantioselectivety using chiral ephedrine supported on polystyrene, the enantioselectivities of the reaction in alkylbenzenes are much higher than those in individual aromatic (benzene) and aliphatic (hexane) hydrocarbons.
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Soai et al. (1994) studied this question.
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