Ionisation potentials in structure analysis of isomeric nitrones,oxaziranes, O-ether oximes and acid amides

Comparative studies of the ionisation potentials and the mass spectra of some isomeric nitrones, oxaziranes, O-ether oximes and acid amides gave no evidence for hermally-induced isomerisation in the mass spectrometer. Characteristic differences in the electron-impact-induced fragmentation patterns are discussed.