Electron‐impact induced fragmentations of some quinazolinediones and benzoxazinones

Marja Himottu, Kalevi Pihlaja, G. Stájer, Pirjo Vainiotalo

Research output: Contribution to journalArticle

8 Citations (Scopus)


Mass spectral fragmentations of 3‐substituted 2,4(1H,3H)‐quinazolinediones, 2‐phenylimino‐4H‐3,l‐benzoxazin‐4‐ones and 2‐thioxo‐2,3‐dihydroquinazolidin‐4(1H)‐one were examined using metastable‐ion analy sis and exact mass measurements. The isomeric compounds were easy to distinguish from their mass spectra. For quinazolinediones, the most surprising feature was the loss of CO2 showing that a rearrangement due to anilino migration must occur in these compounds. In comparison, the benzoxazinones showed no elimination of carbon dioxide.

Original languageEnglish
Pages (from-to)374-377
Number of pages4
JournalRapid Communications in Mass Spectrometry
Issue number5
Publication statusPublished - 1993

ASJC Scopus subject areas

  • Analytical Chemistry
  • Spectroscopy
  • Organic Chemistry

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