ELECTRON-IMPACT IONIZATION MASS-SPECTRA OF SOME 4,9-DIHETERO-(X,X)-CYCLODECA-1,6-DIENES - MONO-BENZO AND DI-BENZO ANALOGS

The mass spectral behaviour of 4,9-dihetero-(X,X)-cyclodeca-1,6-dienes depends greatly on the hetero atom X and the number of benzo fusions on the heterocyclic ring. The molecular ions were fairly unstable exce pt when X = N and there was an aromatic bridge between the nitrogen at oms or when X was S. All the spectra exhibited peak patterns where the ion compositions differed from each other by only a few hydrogen atom s. The predominance of the various peak patterns and their shapes vari ed from compound to compound. The type of V-substituents R or bridge g roups also reflected their influence on the fragmentation characterist ics.