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  • Wiley-Blackwell  (2)
  • 1975-1979  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 11 (1976), S. 1063-1076 
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The fragmentation mechanisms of (5α) 3,17-androstanedione have been studied in order to determine whether the deuterium is located at C-4 or C-6. This is possible at low voltage where a peak at m/e 216, arising from a A-ring cleavage allows the determination of isotope distribution between C-4 and C-6.
    Notes: Les fragmentations de al (5α) androstanedione-3,17 ont été étudiées en vue de localiser le deutérium entre les positons 4 et 6. Ceci est possible en basse tension: on trouve un pic à m/e 216, provenant d'une élimination du cycle. A qui permet le dosage de molécules deutériées en 4 et (ou) 6.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The detailed study of the mass spectra of cyclopentanone and cyclohexanone acetals produces new evidences for the rearrangement of the corresponding molecular ions. The rearrangement was quantitatively studied with the help of a simple model. The influence of different structural features is discussed.
    Notes: L'étude détaillée des spectres de masse des éthyléne acétals dérivés de cyclopentanones et de cyclohexanones apporte de nouveaux arguments en faveur d'une transposition de l'ion moléculaire. Un modèle simplifié permettant l'étude quantitiative de ce réarrangement est proposé. L'influence de divers facteurs structuraux sur ce réarrangement est discutée.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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