Mass spectrometry of aromatic cyclic imides and amides. Part II: Electron ionization induced decomposition of N-substituted 3,4-pyridinedicarboximides

Abstract

The behaviour of a series of N-substituted 3,4-pyridinedicarboximides under electron impact at 70 eV is analyzed. Compounds under study were divided into three groups: 3,4-pyridinedicarboximidoacetic, β-3,4- pyridinedicarboximidopropionic and γ-3,4-pyridinedicarboximidobutyric acid derivatives (compounds 1, 2 and 3 respectively), which in turn determine the dominant fragmentations. The proposed fragmentation patterns are supported by HRMS and tandem mass spectrometry. Results are in some cases compared to data from the related 2,3-pyridinedicarboximides 4. © ARKAT USA, Inc.