Proximity effects in mass spectrometry. Electron impact ionization-induced cyclization of 1,2-bis(1,4-dithiafulven-6-yl)benzenes
✍ Scribed by P. Frère; A. Gorgues; J. Garín; J. Orduna
- Publisher
- John Wiley and Sons
- Year
- 1994
- Tongue
- English
- Weight
- 308 KB
- Volume
- 29
- Category
- Article
- ISSN
- 1076-5174
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✦ Synopsis
Abstract
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.