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Proximity effects in mass spectrometry. Electron impact ionization‐induced cyclization of 1,2‐bis(1,4‐dithiafulven‐6‐yl)benzenes
Author(s) -
Frère P.,
Gorgues A.,
Garín J.,
Orduna J.
Publication year - 1994
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.1210291011
Subject(s) - electron ionization , mass spectrometry , ionization , chemistry , electron , analytical chemistry (journal) , physics , organic chemistry , ion , chromatography , nuclear physics
The electron impact ionization mass spectra of o ‐, m ‐ and p ‐bis(1,4‐dithiafulven‐6‐yl)benzenes were studied by means of accurate mass measurements, metastable analysis and collision‐induced dissociation. Differences observed in the spectra of the ortho isomers are due to a cyclization reaction leading to molecular ions with the same structure as those generated from certain cyclic compounds, as confirmed by comparison of linked scans at constant B/E of metastable and collisionally activated molecular ions. Parallels of this cyclization of molecular ions with their electrochemical or acid‐induced isomerization are also discussed.