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  • 1970-1974  (2)
  • 1973  (2)
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  • 1970-1974  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 271-276 
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 1,2,4- and 1,2,3-triazoles behave similarly upon electron-impact; this is ascribed to the formation of common ionic structures. Metastable transitions observed for the loss of nitrogen are studied and interpreted in terms of: (i) the existance of the two tautomers of 1,2,3-triazole in the gaseous phase and (ii) the isomerisation of the molecular ion before fragmentation.
    Notes: La similitude de comportement des 1,2,4- et 1,2,3-triazoles sous l'impact électronique est attribuée à la formation de structures ioniques communes. L'étude des transitions métastables correspondant à al perte d'une molécule d'azote semble indiquer que, dans le cas du 1,2,3-triazole, les deux formes tautoméres coexistent à l'état gzaeux et qu'une isomérisation partielle de l'ion moléculaire se produit dégradation.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 2
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 1267-1277 
    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 behaviour of benzotriazole and some alkyl derivatives upon electron-impact has been studied. Evidence for the exclusive presence of the 1H-benzotriazole tautomer in the gaseous phase is presented. The 2H-benzotriazole ‘molecular ion’ is generated from 2-ethylbenzotriazole by ethylene elimination; isomerisation into the 1H tautomer precedes the fragmentation (nitrogen loss). A ring expansion reaction is proposed for the [M - CH3]+ ions of 1-ethyl- and 2-ethylbenzotriazoles.
    Notes: Les spectres de masse du benzotriazole et de quelques dérivés alkylés sont discutéS. Seul le tautomère 1H-benzotriazole est mis en évidence en phase gazeuse. L'‘ion moléculaire’ du 2H-benzotriazole est formé par érlimination d'éthylèene au départ du 2-éthylbenzotriazole; une isomérisation en tautomère 1H précède la fragmentation (perte d'azote). On observe une réaction d'extension cyclique au niveau des ions [M-CH3]+ des 1-éthyl-et 2-éthylbenzotriazoles.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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