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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: Chiral Dicarbonyl(η5-cyclopentadienyl) Complexes of Molybdenum and Tungsten with Anions of α-Amino AcidsA series of chiral complexes (η5-C5H5)M(CO)2(L-L′) (M = Mo, W; L-L′ = Gly-O, Sar-O, Me2Gly-O, L-Ala-O, 2-Me-L-Ala-O, L-Val-O, L-Ser-O, L-Thr-O, L-His-O, L-Phe-O, Bzl-L-Phe-O, L-Pro-O, S-Me-L-Cys-O, L-Lys-O, L-Glu-O, L-Cys-O, L-Pen-O) (1a-t, 2a, b, 3, 4) has been prepared and spectroscopically characterized. The diastereomers can be distinguished by their 1H and 13C NMR spectra. They are configurationally stable in solution. The sarcosinato complex 1b can be resolved into the diastereomeric pairs of enantiomers. In alkaline medium a rapid equilibrium of the diastereomers (1:1) is obtained due to isomerization at the coordinated N-atom. The structure of the DL-serinato complex 1i has been determined by X-ray analysis. The unit cell contains two pairs of enantiomers (RMoRC and SMoSC).
    Notes: Eine Reihe von chiralen Komplexen (η5-C5H5)M(CO)2)(L-L′) (M = Mo, W; L-L′ = Gly-O, Sar-O, Me2Gly-O, L-Ala-O, 2-Me-L-Ala-O, L-Val-O, L-Ser-O, L-Thr-O, L-His-O, L-Phe-O, Bzi-L-Phe-O, L-Pro-O, S-Me-L-Cys-O, L-Lys-O, L-Glu-O, L-Cys-O, L-Pen-O) (1a-t, 2a, b, 3, 4) wurde dargestellt und spektroskopisch charakterisiert. Die Diastereomeren lassen sich durch ihre 1H- und 13C-NMR-Spektren unterscheiden. Sie sind in Lösung konfigurationsstabil. Der Sarkosinato-Komplex 1b läßt sich in die diastereomeren Enantiomerenpaare trennen. In alkalischem Medium stellt sich infolge Isomerisierung am koordinierten N-Atom das Diastereomerengleichgewicht 1:1 ein. Die Struktur des DL-Serinato-Komplexes 1i wurde röntgenographisch bestimmt. Die Elementarzelle enthält zwei Enantiomerenpaare (RMoRC und SMoSC).
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 117 (1984), S. 827-832 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Dicarbonyl(η5-cyclopentadienyl)molybdenum Complexes with 2-Iminocarboxylate as Chelate Ligand)A series of chiral 2-iminocarboxylato complexes (η5-C5H5)(CO)2MoN(R2)=C(R1)COO (1) (R1 = H, Me, Et, i-Pr; R2 = H, Me, Ph, OH, NH2, NHPh, (S)-CHMePh, CH2CO2Et) has been prepared from (η5-C5H5)(CO)3MoCl, the sodium salt of 2-oxocarboxylic acid and R2NH2 and spectroscopically characterized (IR, 1H NMR). Diastereomers of 1 have been obtained with (S)-1-phenylethylamine as amine component.
    Notes: Eine Reihe von chiralen 2-Iminocarboxylato-Komplexen (η5-C5H5)(CO)2MoN(R2)=C(R1)COO (1) (R1 = H, Me, Et, i-Pr; R2 = H, Me, Ph, OH, NH2, NHPh, (S)-CHMePh, CH2CO2Et) wurde aus (η5-C5H5)(CO)3MoCl, dem Natriumsalz der 2-Oxocarbonsäure und R2NH2 dargestellt und IR- und 1H-NMR-spektroskopisch charakterisiert. Mit (S)-1-Phenylethylamin als Aminkomponente wurden Diastereomere von 1 erhalten.
    Additional Material: 3 Tab.
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