In the asymmetric hydrogenation of ethyl pyruvate over the catalyst system cinchonidine–Pt/Al2O3 the enantioselectivity was significantly improved by addition of different achiral tertiary amines to the reaction mixture, however the effect appeared to be strongly solvent and concentration dependent.
J. L. Margitfalvi, E. Tálas and M. Hegedûs, Chem. Commun., 1999, 645 DOI: 10.1039/A900681H
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