| Abstract: | The negative ion mass spectra of cyano substituted heterocyclic compounds show specific fragmentation pathways which are of analytical importance for the distinction between isomeric compounds. All the compounds examined fragment directly to give  or ions. The ion structures involved were determined by the analysis of the metastable transitions and collisional activation spectra. The fragmentations of tetracyano substituted heterocyclic compounds are explained by rearrangement processes of the molecular anions. |
