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Identification of some isomeric [C 8 H 6 O] + ˙ ions generated from phenyl substituted cyclic ketones using collisional activation
Author(s) -
Van Den Heuvel C. G.,
Nibbering N. M. M.,
Heimbach H.,
Levsen K.
Publication year - 1979
Publication title -
organic mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.475
H-Index - 121
eISSN - 1096-9888
pISSN - 0030-493X
DOI - 10.1002/oms.1210141007
Subject(s) - ketene , ion , kinetic energy , chemistry , mass spectrum , mass spectrometry , analytical chemistry (journal) , spectral line , medicinal chemistry , physics , organic chemistry , chromatography , quantum mechanics , astronomy
[C 8 H 6 O] + ˙ 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 [C 8 H 6 O] + ˙ 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 [C 8 H 6 O] + ˙ 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.