ISSN:
0951-4198
Keywords:
Chemistry
;
Analytical Chemistry and Spectroscopy
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Physics
Notes:
Thermal degradation of O-acyl oximes under electron impact ionization (EI) conditions has been examined. The EI mass spectra gave fragment ions originating from thermal degradation, as well as molecular ions M+· and normal fragment ions due to unimolecular decomposition of the M+· ions. The fragment ions due to thermal degradation of O-acyl oximes were identified by using fast-atom bombardment (FAB) mass spectrometry with a liquid matrix together with the collision-induced dissociation (CID) technique. While the FAB mass spectra of O-acyl oximes gave, preferentially, M+· ions together with some characteristic fragment ions, as well as the molecular related ions [M+H]+ and [M-H]+, the spectra showed little evidence of the fragment ions which may originate from thermal degradation, under EI conditions. The CID spectra of selected M+· ions formed by electron impact also showed little of such fragment ions. The thermal degradation was directly confirmed by measuring the FAB mass spectra of O-acyl oximes that had been heated in a sealed sample tube.
Additional Material:
7 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/rcm.1290091102
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