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Two is better than one: Novel chiral phosphine–olefin ligands 1 a and 1 b act as bidentate ligands with some transition metals and have proved to be highly effective in the rhodium-catalyzed asymmetric 1,4-addition of aryl boronic acids to maleimides with high enantioselectivity (see scheme).
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Shintani et al. (2005) studied this question.
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