Some novel eliminations of neutral fragments from ions in mass spectrometry. Part IV. Loss of carbon dioxide from cyclic imides and isoimides

Abstract

The scope of the reaction leading to the loss of carbon dioxide from cyclic imides and isoimides during mass spectrometry has been examined. Energy measurements and metastable intensities suggest that the reaction does not proceed through the ground state of the corresponding isoimide. The possibility of an electronically excited state mechanism is discussed.