Chemistry of Heterocyclic Compounds

, Volume 16, Issue 12, pp 1230–1234 | Cite as

Mass-spectrometric identification of isomeric 1-benzoyl-2-azetidinones and 2-phenyl-4,5-dihydro-1,3-oxazin-6-ones

  • P. B. Terent'ev
  • Kh. Ivanov
  • A. Dobrev


The mass spectra of isomeric 1-benzoyl-2-azetidinones and 2-phenyl-4,5-dihydro-1,3-oxazin-6-ones were analyzed. A more stable molecular ion and high intensities of the peaks of the ions formed from the molecular ion with the loss of ketene or a substituted ketene are characteristic for the former compounds, while low stability of the molecular ion and a higher probability of the loss of one of the groupings in the 4 position are characteristic for the latter compounds. Fragmentation schemes that are confirmed by the high-resolution mass spectra are presented.


Mass Spectrum Organic Chemistry High Intensity High Probability Ketene 
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Copyright information

© Plenum Publishing Corporation 1981

Authors and Affiliations

  • P. B. Terent'ev
    • 1
    • 2
  • Kh. Ivanov
    • 1
    • 2
  • A. Dobrev
    • 1
    • 2
  1. 1.M. V. Lomonosov Moscow State UniversityMoscow
  2. 2.K. Okhridskii Sofia UniversitySofiaBulgaria

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