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Liquid assets: The catalyst (S,S)-1 exhibits an unprecedented reactivity and excellent enantioselectivity for the title reaction when it is carried out in neat ionic liquid (see scheme; BMIM=1-n-butyl-3-methylimidazolium, Tf=trifluoromethanesulfonyl, Ts=4-toluenesulfonyl). The ionic liquid facilitates the catalyst recycling and enhances its stability and selectivity.
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Zhou et al. (2008) studied this question.
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