Spectroscopic and structural studies of some oxocarbon condensation products—II

The mass spectrometric data are reported for 19 condensation products of 5 and 6-membered ring oxocarbons and various o-phenylenediamines. The fragmentation mechanisms are discussed and compared with earlier conflicting reports. There is a close similarity between the corresponding 5 and 6-membered ring oxocarbon condensation products in their spectral fragmentation mechanisms which is analogous to the similarity between the fragmentation of the oxocarbons themselves.