Electron impact studies. CVII—Negative ion mass spectra of the oxime group. Monoximes derived from α‐dicarbonyl systems

Specific losses of water are observed from the molecular anions of monoximes of α‐diketones. Labelling studies, kinetic energy release values and the +E spectra of magnified image ions have been used to aid in the elucidation of the fragmentation pathways. It is proposed that the majority of magnified image ions have α‐keto nitrile structures.