Studies in organic mass spectrometry. Part 27. Electron ionisation induced isomerisation of 3-aryl-4(3H)-quinazolinones

Ceraulo, L. and Di Stefano, V. and Ferrugia, N. and Ludányi, Krisztina and Segreto, S. and Vékey, Károly (2001) Studies in organic mass spectrometry. Part 27. Electron ionisation induced isomerisation of 3-aryl-4(3H)-quinazolinones. RAPID COMMUNICATIONS IN MASS SPECTROMETRY, 15 (6). pp. 433-439. ISSN 0951-4198

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Abstract

The comparison between 70 eV EI (electron ionisation) mass spectra, MIKE (mass analysed ion kinetic energy) and CID (collision induced dissociation) MIKE spectra, KER (kinetic energy release) and KERD (kinetic energy release distribution) data for 2-methyl-3-aryl-4(3H)-quinazolinones 1-4, with those of the corresponding 2-methyl-4-aryloxyquinazolines 1'-4', indicates that aryloxy radical as well as hydrogen or methyl radical losses involve the formation of common intermediates. This suggests the occurrence of migrations of aryl groups from the N-3 atom to carboxylic oxygen in the molecular ions of 1-4.

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