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Mass spectra of benzotriazoles. Correlation with thermolytic and photolytic fragmentations
Author(s) -
Ohashi Mamoru,
Tsujimoto Kazuo,
Yoshino Akira,
Yonezawa Teijiro
Publication year - 1970
Publication title -
organic mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.475
H-Index - 121
eISSN - 1096-9888
pISSN - 0030-493X
DOI - 10.1002/oms.1210040122
Subject(s) - fragmentation (computing) , chemistry , mass spectrum , electron ionization , alkyl , ion , hydrogen , photochemistry , molecule , nitrogen , mass spectrometry , polyatomic ion , spectral line , aryl , organic chemistry , physics , ionization , chromatography , astronomy , operating system , computer science
The mass spectra of some alkyl, aryl and acyl benzotriazoles are reported and discussed on the basis of their thermolytic and photolytic fragmentation products. All benzotriazoles so far studied lose a molecule of nitrogen to give the intermediate radical cations upon electron‐impact. Subsequently cyclization and a hydrogen migration lead them to the molecular ions of thermolytic and photolytic fragmentation products. A general rule for predicting the possibility of 1‐3 hydrogen migration, based on a knowledge of the electronic state of the radical cation is proposed.