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• W2079753887 abstract "Two Michael-type addition reactions of nitromethane to chalcone, reaction (1a), and of methyl 1-oxo-2-indanecarboxylate to methyl vinyl ketone (reaction (1b)) have been tested for catalytic asymmetric induction when carried out in the presence of Ni(II) or Co(II) and homochiral ligands. Proline-derived ligands in conjunction with Ni(II) are found to be moderately effective asymmetric inductors in the former addition (up to 59% e.e.). For this addition the absolute configuration of the adduct (2) has been established via correlation with (S)-(+)-1-(dimethylamino)-2,4-diphenylbutan-4-one (21). For reaction (1b), Co(II) complexes appear to be the more effective catalysts; the highest e.e. (38%) was obtained with a tetradentate ligand, a diaminodiol (16). Although the e.e.s so far obtained are not much better than those previously obtained, the method appears to allow further improvement." @default.
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• W2079753887 date "1991-05-01" @default.
• W2079753887 modified "2023-10-12" @default.
• W2079753887 title "Asymmetric Michael additions catalysed by Ni(II) and Co(II) complexes with homochiral ligands" @default.
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• W2079753887 doi "https://doi.org/10.1016/0304-5102(91)85016-u" @default.
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