Garver JM, Yang Z, Kato S, Wren SW, Vogelhuber KM, Lineberger WC, Bierbaum VM. Gas phase reactions of 1,3,5-triazine: proton transfer, hydride transfer, and anionic σ-adduct formation.
JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2011;
22:1260-1272. [PMID:
21953109 DOI:
10.1007/s13361-011-0133-9]
[Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2011] [Revised: 03/17/2011] [Accepted: 03/17/2011] [Indexed: 05/31/2023]
Abstract
The gas phase reactivity of 1,3,5-triazine with several oxyanions and carbanions, as well as amide, was evaluated using a flowing afterglow-selected ion flow tube mass spectrometer. Isotopic labeling, H/D exchange, and collision induced dissociation experiments were conducted to facilitate the interpretation of structures and fragmentation processes. A multi-step (→ HCN + HC(2)N (2) (-) → CN(-) + 2 HCN) and/or single-step (→ CN(-) + 2 HCN) ring-opening collision-induced fragmentation process appears to exist for 1,3,5-triazinide. In addition to proton and hydride transfer reactions, the data indicate a competitive nucleophilic aromatic addition pathway (S(N)Ar) over a wide range of relative gas phase acidities to form strong anionic σ-adducts (Meisenheimer complexes). The significant hydride acceptor properties and stability of the anionic σ-adducts are rationalized by extremely electrophilic carbon centers and symmetric charge delocalization at the electron-withdrawing nitrogen positions. The types of anion-arene binding motifs and their influence on reaction pathways are discussed.
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