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Study of the mass spectral fragmentation processes in dinitroquinoxalines using tandem methodologies

par Heilporn, Sylvie ;Kaisin, Michel ;Flammang, Robert
Référence European journal of mass spectrometry, 5, 1, page (59-67)
Publication Publié, 1999

Article révisé par les pairs

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Résumé :

Following electron ionization, the fragmentations of isomeric dinitroquinoxalines have been investigated making use of tandem mass spectrometry methodologies such as collisional activation (CA), various linked-scanning (LS) experiments, and mass-analyzed ion kinetic energy (MIKE) spectrometry. It was shown that, for the two ortho-dinitroquinoxalines 1 and 2, the most abundant fragment ion at m/z 116 is generated for 1 by successive losses of NO2•, CO, and NO•, whereas for 2, it is the result of two main competing fragmentation routes. The fragmentation of the meta-dinitroquinoxaline 3 differs significantly as an abundant and quite characteristic ion at m/z 127 is the result of consecutive eliminations of NO2• and HNO2. Substitution of the pyrazine ring (for example, compounds 4 and 5) or of the benzene ring (for example, compounds 6 and 7) strongly modifies the reactivity.