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  • 1
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Asymmetric Catalyses, 11. Calculation of Enantioselectivities in the Rh-catalyzed Hydrogenation of Amino Acid Precursors with the Ruch/Ugi ModelSix cinnamic acid and acrylic acid derivatives, differing only in one substituent, were enantioselectively hydrogenated to give the corresponding phenylalanine and alanine derivatives. As catalysts mixtures of [(1,5-COD)RhCl]2 with the optically active phosphanes (-)-Norphos, (+)-Prophos, (+)-Diop, and (-)-BPPFA were used. The analysis of the results with the Ruch/Ugi theory shows that, even knowing the λ-parameters of the substrate substituents and the p-parameters of the catalysts, the enantioselectivities found cannot be calculated.
    Notes: Sechs Zimtsäure- und Acrylsäure-Derivate, die sich nur in einem Substituenten unterscheiden, werden enantioselektiv zu den entsprechenden Phenylalanin- und Alanin-Derivaten hydriert. Als Katalysatoren dienen Mischungen aus [(1,5-COD)RhCl]2 und den optisch aktiven Phosphanen (-)-Norphos, (+)-Prophos, (+)-Diop und (-)-BPPFA. Die Auswertung der Ergebnisse mit der Ruch/Ugi-Theorie zeigt, daß man auch bei Kenntnis der λ-Parameter der Substratsubstituenten und der p-Parameter der Katalysatoren die gefundenen Enantioselektivitäten nicht berechnen kann.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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