Unexpected change of the sense of the enantioselective hydrogenation of ethyl pyruvate catalyzed by a Pt–alumina-cinchona alkaloid system
2002
Bartók, M. | Sutyinszki, M. | Felföldi, K. | Szöllősi, Gy
In the enantioselective hydrogenation of ethyl pyruvate (EtPy) over β-isocinchonine (β-ICN) modified Pt–alumina catalysts, the major enantiomer was (R)-ethyl lactate ((R)-EtLt (ee 50%)) in toluene, while in AcOH (S)-EtLt (ee 60%) was formed; the (R) configuration is opposite to what is expected from the absolute configuration of the cinchonine backbone.
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