Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/58774
Type: Artigo de periódico
Title: R(Ar)O-N-2(+) vs. R(Ar)-N2O+: Are alkoxy-(aryloxy-)diazonium ions or alkyl-(aryl-)N-nitroso-onium ions formed in the gas-phase reactions of N2O with H+, Me+, Ph+, PhCH2+, Tr+ and PhCO+?
Author: Cabrini, LG
Benassi, M
Eberlin, MN
Okazaki, T
Laali, KK
Abstract: Gas-phase reactions of N2O with H+, Me+, Ph+, PhCH2+, Tr+ (the tropylium. ion) and PhCO+ were studied by pentaquadrupole mass spectrometry. Collision-induced dissociation (CID) of the product ions establishes that, in the diluted solvent and counterion-free MS environment, gaseous Me+ and Ph+ ions form preferentially Me(Ph)O-N-2(+) (electrophilic attack at oxygen), whereas PhCH2+ forms preferentially PhCH2-N2O+ (electrophilic attack at nitrogen). The nascent phenoxydiazonium. ion PhO-N-2(+) dissociates promptly by N-2 loss to form PhO+ as the observable addition product. The PhCO+ and Tr+ ions are unreactive towards addition to N2O. The CID and ion/molecule chemistry of [N2O + H](+) are in conclusive with regard to connectivity, because the ion is rather resistant towards dissociation and reacts essentially as a proton donor species. Gaseous MeO-N-2(+) is not only efficient as a methylating agent towards ethers, heteroaromatics and nitriles, but also displays a rich chemistry that includes polar [4+2(+)] stepwise cycloadditions with representative dienes and polar transacetalization with cyclic acetals. Relative energies and geometries of various RO-N-2(+)/R-N2O+ isomeric pairs were evaluated by MP2 and DFT calculations. ((c) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007).
Subject: alkoxy-(aryloxy-)diazonium ions
alkyl-(aryl-)N-nitroso-onium ions
ion-molecule reactions
pentaquadrupole mass spectrometry
polar cycloadditions
polar transacetalization
Country: Alemanha
Editor: Wiley-v C H Verlag Gmbh
Rights: fechado
Identifier DOI: 10.1002/ejoc.200600679
Date Issue: 2007
Appears in Collections:Unicamp - Artigos e Outros Documentos

Files in This Item:
File Description SizeFormat 
WOS000243303000008.pdf235.36 kBAdobe PDFView/Open


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.