Fragmentation and skeletal rearrangements of products of the reaction between fluorobenzenes and bicyclic N-bases studied by electron ionization mass spectrometry

The electron ionization (EI) induced mass spectrometric fragmentation pathways of the titled compounds were studied by electron ionization mass spectrometry. It was found that in the case two isomers are formed in one reaction, the substantially different fragmentation patterns enable to discriminate between them. All of the compounds studied have shown simple bond ruptures in the alkyl chain, some of them were accompanied by H-shift. Moreover, complex rearrangements, depending on compound structure, were also observed. In order to better understand the latter processes, mass spectra of isotope-labeled compounds, B/E mass spectra of metastable ions and high resolution mass spectra were recorded.