Abstract
Abstract[C8H6O]+˙ ions with o‐quinonoid ketene, benzocyclobutenone, phenyl ketene and benzofuran structures have been generated from various precursors. Their collisionally induced decompositions in both field free regions of a double focusing mass spectrometer with so‐called reversed geometry have been studied using mass analysed ion kinetic energy scans and B/E linked scans. In both cases the abovementioned [C8H6O]+˙ structures can be distinguished–except the benzocyclobutenone ion which gives very similar spectra to the o‐quinonoid ion–on the basis of the intensity ratios [m/z 77]/[m/z 76] and [m/z 104]/[m/z 102]. The stable [C8H6O]+˙ ions generated from the molecular ions of 7 ‐phenylbicyclo[3.1.1]heptan‐6‐one appear to have the phenyl ketene structure, as was suspected from previous kinetic energy release measurements.
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