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  • Analytical Chemistry and Spectroscopy  (4)
  • Wiley-Blackwell  (4)
  • Institute of Physics (IOP)
Collection
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  • Analytical Chemistry and Spectroscopy  (4)
  • Chemistry  (4)
Publisher
  • Wiley-Blackwell  (4)
  • Institute of Physics (IOP)
Years
  • 1
    Electronic Resource
    Electronic Resource
    The mass spectra of N-acyliminopyridinium and isoquinolinium betaines (1971)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1971), S. 61-71 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The mass spectral fragmentation behaviour of N-acyliminopyridinium and isoquinolinium betaines has been investigated. Major fragmentations of the pyridinium betaines can be rationalized in terms of charge localization on the pyridinium nitrogen. The most prominent process is α-cleavage followed by loss of NCO to furnish a pyridine ion. The electron-impact induced fragmentation of N-benzoyliminopyridinium betaine (I) was compared with that of thermolysis. The completely analogous behaviour has been observed in the corresponding isoquinolinium betaines.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210050108
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  • 2
    Electronic Resource
    Electronic Resource
    Studies in organic mass spectrometry - IV:For part III see Ref. 1. N-iminopyridinium betaines (1971)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1971), S. 935-938 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The mass spectra of N-iminopyridinium betaines, which have been generated within the ion source by pyrolysis of the corresponding hydrochlorides, have been compared with those of pyridine N-oxides.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210050804
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  • 3
    Electronic Resource
    Electronic Resource
    Studies in organic mass spectrometry - IIFor part I see Ref. 1 (1971)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1971), S. 389-396 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The mass spectra of various N-aryliminopyridinium and isoquinolinium betaines have been recorded. The most prominent fragmentation process of these compounds is N-N bond cleavage with the charge retention on both the pyridine and aryl fragments. An ortho-effect has been observed in the mass spectrum of N-o-nitrophenyliminopyridinium betaine (IXa).
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210050405
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  • 4
    Electronic Resource
    Electronic Resource
    Studies in organic mass spectrometry - V:For Part IV, see ref. 3. N-arylsulphonyliminopyridinium betaines (1971)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1971), S. 1383-1390 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The mass spectral fragmentation of N-arylsulphonyliminopyridinium betaines has been rationalized using high resolution mass spectrometry as well as deuterium labelling. The most characteristic features are a very facile N—S bond cleavage and skeletal rearrangements accompanied by the expulsion of SO2 from the molecular ion and the [M—1] ion to the corresponding ionized N-aryliminopyridinium betaines and azacarbazoles, respectively. The presence of methyl substituents at the α-position of the pyridine ring has a significant effect on the mode of the fragmentation.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210051205
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