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  • Chemistry  (2)
  • 1980-1984  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 8 (1981), S. 347-350 
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The analytical response of 45 single polychlorinated biphenyls to electron impact mass spectrometry was measured by monitoring their positive molecular ion intensity. The results showed little variability in response within the isomer groups with the same number of chlorine atoms, and the average response is proposed as a basis for quantitation of the polychlorinated biphenyl level for the corresponding degree of chlorination. The possibility of distinguishing the level of each polychlorinated biphenyl group by a method as specific and sensitive as gas chromatography combined with mass spectrometry could be very useful, especially in toxicology studies. Preliminary data obtained from application of the technique in studies of marine organisms are presented.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: A Kinetic Study of Reactions of Substituted Anthracenes with Maleic AnhydrideHerrn Prof. Dr. R. Huisgen in herzlicher Verbundenheit zum 60. Geburtstag gewidmet.Kinetic data for the Diels-Alder addition of 2-, 9- and 9,10-disubstituted anthracenes with maleic anhydride are interpreted in terms of FMO-theory. While the simplest form of FMO-theory does not give satisfactory results, inclusion of eigenvector coefficients at the reacting centers does provide an improvement.
    Notes: Die kinetischen Daten der Diels-Alder-Reaktion von 2-, 9- und 9,10-substituierten Anthracenen mit Maleinsäureanhydrid lassen sich durch die FMO-Theorie in ihrer einfachsten Form nur unbefriedigend beschreiben. Eine Berücksichtigung der Eigenvektorkoeffizienten der reagierenden Zentren bringt eine deutliche Verbesserung der Korrelation.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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