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- W4229809498 abstract "Although many chiral catalysts are known that allow highly enantioselective hydrogenation of a wide range of olefins, no suitable catalysts for the asymmetric hydrogenation of α,β-unsaturated nitriles have been reported so far. We have found that Ir N,P ligand complexes, which under normal conditions do not show any reactivity towards α,β-unsaturated nitriles, become highly active catalysts upon addition of N,N-diisopropylethylamine. The base-activated catalysts enable conjugate reduction of α,β-unsaturated nitriles with H2 at low catalyst loadings, affording the corresponding saturated nitriles with high conversion and excellent enantioselectivity. In contrast, alkenes lacking a conjugated cyano group do not react under these conditions, making it possible to selectively reduce the conjugated CC bond of an α,β-unsaturated nitrile, while leaving other types of CC bonds in the molecule intact." @default.
- W4229809498 created "2022-05-11" @default.
- W4229809498 creator A5019465487 @default.
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- W4229809498 date "2014-03-20" @default.
- W4229809498 modified "2023-09-23" @default.
- W4229809498 title "Asymmetric Hydrogenation of α,β-Unsaturated Nitriles with Base-Activated Iridium N,P Ligand Complexes" @default.
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- W4229809498 doi "https://doi.org/10.1002/ange.201402053" @default.
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