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|Type:||Artigo de periódico|
|Title:||Reactions Of Gaseous Halocarbonyl Cations With Aromatic Compounds: Ionic Carbonylation Of Inert C-h Bonds|
|Author:||Da Rocha L.L.|
|Abstract:||The mass-selected halocarbonyl cations FCO+, ClCO+, and BrCO+ were reacted with benzene, thiophene, pyrrole, and furan and a few of their alkyl derivatives to evaluate the ability of XCO+ ions to promote C-H bond activation of aromatic compounds (M-H) via gas-phase ionic carbonylation. This novel reaction occurs via electrophilic addition followed by prompt HX elimination, forms the respective acylium ions (M-CO+), and competes with electron abstraction and X+ transfer. The intrinsic gas-phase reactivity order observed for ionic carbonylation was: FCO+>ClCO+>BrCO+. The ability of the fluorosulfinyl cation (FSO+) to promote analogous ionic sulfonylation of aromatic compounds was also tested, but owing to its high recombination energy, FSO+ acts as a potent oxidizing agent and electron abstraction dominates. A novel, highly efficient and nearly exclusive O-abstraction reaction of FC+ and SF+ with N2O was used to the straightforward preparation of gaseous FCO+ and SFO+. B3LYP/6-311G++(d,p) potential energy surface diagrams were elaborate to help rationalize the observed reactivity trends. © 2003 Elsevier Science B.V. All rights reserved.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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