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Mass spectral study of differently substituted 2‐oxo‐ and 2‐thioxo‐1,3,4‐benzotriazepines
Author(s) -
Vainiotalo P.,
Mälkönen P. J.,
Richter P.,
Morgenstern O.
Publication year - 1990
Publication title -
journal of heterocyclic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.321
H-Index - 59
eISSN - 1943-5193
pISSN - 0022-152X
DOI - 10.1002/jhet.5570270227
Subject(s) - chemistry , fragmentation (computing) , mass spectrum , electron ionization , metastability , mass , ionization , ion , spectral line , mass spectrometry , computational chemistry , analytical chemistry (journal) , medicinal chemistry , organic chemistry , chromatography , physics , astronomy , computer science , operating system
The mass spectra of seven 2‐thioxo‐ and four 2‐oxo‐1,3,4‐benzotriazepines were recorded under electron ionization, and the fragmentation patterns were elucidated by exact mass measurement and metastable ion analysis. Some variations in the nature and position of the substituents greatly affected the mass spectra, allowing easy differentiation of isomeric compounds. The most characteristic feature of the mass spectral behavior of the compounds was the large number of ring contraction and complicated rearrangement reactions.