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Loss of isocyanic acid from the internal oxadiazole ring of protonated molecules of some 2,5‐diaryl‐1,3,4‐oxadiazoles
Author(s) -
Frański Rafał,
Schroeder Grzegorz,
Rybachenko Volodymir,
Szwajka Oles P.
Publication year - 2002
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/rcm.575
Subject(s) - isocyanic acid , chemistry , fragmentation (computing) , protonation , electrospray ionization , molecule , mass spectrometry , mass spectrum , ion , ring (chemistry) , metastability , ionization , analytical chemistry (journal) , oxadiazole , ion source , computational chemistry , photochemistry , organic chemistry , chromatography , computer science , operating system
The fragmentation pattern of some protonated 2,5‐diaryl‐1,3,4‐oxadiazoles is discussed. An unusual decomposition consisting of elimination of the isocyanic acid molecule from the internal oxadiazole ring was found. This fragmentation pathway was deduced on the basis of B/E linked scan mass spectra of metastable ions with liquid secondary ion mass spectrometry as the ionization method and also of low‐energy CID mass spectra where electrospray was used as the ionization technique. High resolution measurements were also performed. Copyright © 2002 John Wiley & Sons, Ltd.