Formation and structural discrimination of stable halophenylium ions in the gas phase

Citation
A. Filippi et al., Formation and structural discrimination of stable halophenylium ions in the gas phase, INT J MASS, 196, 2000, pp. 21-31
Citations number
44
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Spectroscopy /Instrumentation/Analytical Sciences
Journal title
INTERNATIONAL JOURNAL OF MASS SPECTROMETRY
ISSN journal
1387-3806 → ACNP
Volume
196
Year of publication
2000
Pages
21 - 31
Database
ISI
SICI code
1387-3806(20000121)196:<21:FASDOS>2.0.ZU;2-4
Abstract
Fourier-transform ion cyclotron resonance mass spectrometry has been used t o identify and characterize the three isomers of X-phenylium ions (X = Cl, Br), through their reactivity features towards CH3Y (Y = Cl, Br). Pure orth o-, meta-, and para-X-phenylium ions (X = Cl, Br) have been independently g enerated in the source of the instrument by CF;-induced F- abstraction from the corresponding X-fluorobenzenes. Isomeric X-phenylium ions (X = Cl, Br) attack the Y atom and the C-H bonds of CH,Y yielding excited adducts which undergo extensive fragmentation by releasing a hydrogen halide molecule, a methyl halide, a halogen atom, or a methyl radical, Competition among thes e fragmentation pathways depends upon the nature of X and Y and the specifi c X-phenylium isomer. (C) 2000 Elsevier Science B.V.