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• W2615704951 abstract "New modifiers were prepared from l-tryptophane and tested in the enantioselective hydrogenation of ethyl pyruvate over commercial alumina supported platinum catalyst. Most of these molecules induced only low enantiomeric excesses (ee). (S)-3-(1-methyl-indol-3-yl)-2-methylamino-propan-1-ol was found to be the most effective. Using this modifier under mild reaction conditions (1 bar hydrogen pressure, 273 K), enantiomeric excess up to 43% was obtained. Due to the transformation of the modifier evidenced by ESI-MS, a slight increase in hydrogen pressure led to a dramatic drop of enantioselectivity. An interesting inversion of the sense of enantioselectivity was observed in the case of this modifier when the reaction was carried out in acetic acid instead of toluene. A possible explanation for this phenomenon is proposed." @default.
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• W2615704951 date "2001-05-01" @default.
• W2615704951 modified "2023-10-18" @default.
• W2615704951 title "Heterogeneous asymmetric reactions" @default.
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• W2615704951 doi "https://doi.org/10.1016/s1381-1169(01)00057-7" @default.
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