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Immobilization of an asymmetric AlLibis(binaphthoxide) catalyst (ALB) is described. The immobilized ALBs (poly-ALBs) are readily prepared from polymeric BINOL derivatives and LiAlH(4). The combined use of 9 mol % of BuLi with ca. 10 mol % (as a monomeric catalyst) of 6,6'-aryl-tethered poly-ALB gave the Michael adducts with up to 93% ee. After completion of the reaction, the insoluble catalyst was recovered in air and is reusable.
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Arai et al. (2000) studied this question.
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