An electron-rich P-stereogenic bisphosphine ligand named "BenzP*" was conveniently prepared from o-dibromobenzene and enantiopure tert-butylmethylphosphine-borane. Its rhodium complex exhibited excellent enantioselectivities of up to 99.9% and high catalytic activity of up to 10,000 h(-1) TOF in asymmetric hydrogenations of various functionalized alkenes.
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Tamura et al. (2010) studied this question.
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