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Type: Artigo de periódico
Title: Gas-phase Reactions For Selective Detection Of The Explosives Tnt And Rdx.
Author: Meurer, Eduardo C
Chen, Hao
Riter, Leah
Cotte-Rodriguez, Ismael
Eberlin, Marcos N
Cooks, R Graham
Abstract: Highly selective gas-phase reactions with ethyl vinyl ether (EVE) of major electron (EI) and chemical ionization (CI) fragment ions of the explosives TNT and RDX have been uncovered. The fragment ion of m/z 210 from TNT undergoes [4(+)+ 2] cycloaddition with EVE to form an oxo-iminium ion of m/z 282, which dissociates by acetaldehyde loss after a [1,5-H] shift to form a quinolynium ion of m/z 238. The fragment ion of m/z 149 from RDX reacts with EVE by a formal vinylation reaction, that is, the elusive cyclic adduct loses ethanol to yield a nitro-iminium ion of m/z 175, which reacts further with EVE to form a second cyclic product ion of m/z 247. Calculations and MS/MS experiments support the proposed structures. These highly characteristic reactions of diagnostic EI and CI fragment ions improve selectivity for TNT and RDX detection.
Citation: Chemical Communications (cambridge, England). , n. 1, p. 40-1, 2004-Jan.
Rights: aberto
Identifier DOI: 10.1039/b309962h
Date Issue: 2004
Appears in Collections:Unicamp - Artigos e Outros Documentos

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