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• W2113442814 abstract "The new unsymmetrical, optically active ligands 1,2-C2H4(PPh2)(2′R,5′R-2′,5′-dimethylphospholanyl) (Laa) and 1,3-C3H6(PPh2)(2′R,5′R-2′,5′-dimethylphospholanyl) (Lbb) form complexes of the type [Rh(L)(cyclooctadiene)][BF4] where L = Laa (1a) or Lbb (1b), [PtCl2(L)] where L = Laa (2a) or Lbb (2b) and [PdCl2(L)] where L = Laa (3a) or Lbb (3b). The crystal structures of 2a and 2b show the chelate ligand backbones adopt δ-twist and flattened chair conformations respectively. Asymmetric hydrogenation of enamides and dehydroaminoesters using 1a and 1b as catalysts show that the ethylene-backboned diphosphine Laa gives a more efficient catalyst in terms of asymmetric induction than the propylene-backboned analogue Lbb. The greatest enantioselectivities were obtained with 1a and enamide substrates with ees up to 91%. Substrate-induced conformational changes in the Rh–diphosphine chelates are proposed to explain some of the ees observed in the hydrogenation of enamides." @default.
• W2113442814 created "2016-06-24" @default.
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• W2113442814 date "2006-01-01" @default.
• W2113442814 modified "2023-09-24" @default.
• W2113442814 title "Allosteric effects in asymmetric hydrogenation catalysis? Asymmetric induction as a function of the substrate and the backbone flexibility of C1-symmetric diphosphines in rhodium-catalysed hydrogenations" @default.
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• W2113442814 doi "https://doi.org/10.1039/b607479k" @default.
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