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• W1979046741 startingPage "563" @default.
• W1979046741 abstract "The diastereomeric 1,4-diphosphine ligands, (S,S,S,S)-1a, (R,S,S,R)-1b and (R,S,S,S)-1c, with the imidazolidin-2-one backbone were synthesized, and utilized for an investigation of the effects of backbone chirality on the enantioselectivity in the Rh(I)-catalyzed hydrogenation of various functionalized olefinic substrates. It was found that the catalytic efficiencies are largely dependent on the configurations of the α-carbons to phosphine. Thus, the Rh complex of the pseudo-C2-symmetrical diphosphine, (R,S,S,S)-1c, showed excellent enantioselectivities (93.0–98.6% ees) in the hydrogenations of a broad spectrum of substrates, and especially in the hydrogenations of methyl α-(N-acetyamino)-β-arylacrylates (95.3–97.0% ees). However, the enantioselectivities obtained with the C2-symmetrical (R,S,S,R)-1b were largely dependent on the substrate (19.8–97.3% ees). The Rh complex of ligand 1a having the (S,S,S,S)-configuration showed the lowest catalytic efficiency for all of the substrates examined (0–84.8% ees)." @default.
• W1979046741 created "2016-06-24" @default.
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• W1979046741 date "2005-03-01" @default.
• W1979046741 modified "2023-09-27" @default.
• W1979046741 title "Synthesis of Diastereomeric 1,4-Diphosphine Ligands Bearing Imidazolidin-2-one Backbone and Their Application in Rh(I)-Catalyzed Asymmetric Hydrogenation of Functionalized Olefins" @default.
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• W1979046741 doi "https://doi.org/10.1002/adsc.200404286" @default.
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