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Type: Artigo de periódico
Title: Gas-phase Polar [4+ + 2] Cycloaddition With Ethyl Vinyl Ether: A Structurally Diagnostic Ion-molecule Reaction For 2-azabutadienyl Cations
Author: Meurer E.C.
Sparrapan R.
Eberlin M.N.
Abstract: The intrinsic reactivity of eight gaseous, mass-selected 2-azabutadienyl cations toward polar [4+ + 2] cycloaddition with ethyl vinyl ether has been investigated by pentaquadrupole mass spectrometric experiments. Cycloaddition occurs readily for all the ions and, with the only exception of those from the N-acyl 2-azabutadienyl cations (N-acyliminium ions), the cycloadducts are found to dissociate readily upon collision activation (CID) both by retro-Diels-Alder reaction and by a characteristic loss of an ethanol (46u) neutral molecule. Ethanol loss from the intact polar [4+ + 2] cycloadduct functions therefore as a structurally diagnostic test: 72 u neutral gain followed by 46 u neutral loss, i.e., as a combined ion-molecule reaction plus CID 'signature' for N-H, N-alkyl and N-aryl 2-azabutadienyl cations. The two N-acyliminium ions tested are exceptional as they form intact cycloadducts with ethyl vinyl ether which dissociate exclusively by the retro-Diels-Alder pathway. Copyright © 2003 John Wiley & Sons, Ltd.
Citation: Journal Of Mass Spectrometry. , v. 38, n. 10, p. 1075 - 1080, 2003.
Rights: fechado
Identifier DOI: 10.1002/jms.523
Date Issue: 2003
Appears in Collections:Unicamp - Artigos e Outros Documentos

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