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- W2017242513 abstract "Dimeric Ir(III) complexes [Ir(P-P)HI2]2 (P-P = enantiopure biophospine) have previously been shown to be efficient catalysts for the enantioselective hydrogenation of imines. In the present study we have prepared the analogues using rac-diop. Among the possible dimers, there was only a slight preference for the μ-I2 heterodimer {[Ir(R,R)-ddiopHI2][Ir(S,S)-diopHI2]}. Although this mixture of dimers was a moderately good catalyst for the hydrogenation of imines, it showed no enantioselectivity, as expected. Addition of the readily available aminophosphinephosphinite ligand, (+)-(S)-pronop, to this dimer mixture in a ratioof [(S)-pronop]:[Ir]tot = 1:1 produced a poor catalyst which effected only a few turnovers in 100h. However, addition of (+)-(S)-pronop to this dimer mixture in a ratio of [(S)-pronop]:[Ir]tot = 1:2 produced an effective catalyst for the enantioselective hydrogenation of imines. Significant chiral amplification was not observed in catalysis with dimers prepared from nonracemic diop." @default.
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- W2017242513 date "1997-01-01" @default.
- W2017242513 modified "2023-10-18" @default.
- W2017242513 title "Chiral poisoning of rac-diop iridium complexes in the catalytic enantioselective hydrogenation of imines" @default.
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- W2017242513 doi "https://doi.org/10.1016/s0022-328x(96)06624-7" @default.
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