Mass-spectrometric study of nitro-substituted dihydrosilaazaanthrones

The effect of the position of the nitro group on the character of the dissociative ionization of nitro-substituted dihydrosilaazaanthrones was studied. It was established that a change in the position of the nitro group in the molecule affects not only the probability of the occurrence of monotypic fragmentations but is also responsible for the development of new pathways of the fragmentation of the molecular ions. This makes it possible to identify the isomeric nitrodihydrosilaazaanthrones from their mass spectra. © 1985 Plenum Publishing Corporation.