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note
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For the preparation and characterization (including X-ray structure) of catalyst 1, see Supporting Information.
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note
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In initial experiments, complexes derived from copper and magnesium salts were found to be inferior to nickel salts in terms of rate and selectivity.
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0037459250
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Kanemasa et al. have used Ni(II) salts as Lewis acids in asymmetric conjugate additions: (a) Itoh, K.; Oderaotoshi, Y.; Kanemasa, S. Tetrahedron: Asymmetry 2003, 14, 635-639.
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note
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It is interesting to note that the free ligand catalyzes the reaction by itself when run in EtOH, giving rise to racemic product.
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