Electron ionization mass spectrometry of some substituted, stereoisomeric, partly saturated 1,3‐ and 3,1‐benzoxazino‐1,3‐benzoxazines

Karoliina Joutsiniemi, Pirjo Vainiotalo, Kalevi Pihlaja, László Lázár, Ferenc Fülöp, Gábor Bernáth

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The electron ionization mass spectra of five substituted, partly saturated 3,1‐benzoxazino‐1,3‐benzoxazines and four substituted 1,3‐benzoxazino‐1,3‐benzoxazines were measured and analysed. The fragmentation pathways were elucidated by metastable ion analysis and exact mass measurement. Although the principal fragmentations were similar for all these compounds, there was an important difference between the two groups as concerns the fragmentation routes. Both routes led to the same fragment ion, but in different ways depending on the ring structure. On the basis of the different fragmentation mechanisms, the 3,1‐benzoxazino‐1,3‐benzoxazines and the 1,3‐benzoxazino‐1,3‐benzoxazines can be distinguished mass spectrometrically. The saturation, the stereochemistry and the substituents all affected the fragmentations, mainly the peak intensities.

Original languageEnglish
Pages (from-to)1035-1037
Number of pages3
JournalRapid Communications in Mass Spectrometry
Issue number11
Publication statusPublished - 1995


ASJC Scopus subject areas

  • Analytical Chemistry
  • Spectroscopy
  • Organic Chemistry

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