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• W1958433582 endingPage "167" @default.
• W1958433582 startingPage "161" @default.
• W1958433582 abstract "The fragmentation of halogen-substituted protonated amines and quaternary ammonium ions (R(1)R(2)R(3)N(+)CH2(CH2)nX, where X = F, Cl, Br, I, n = 1, 2, 3, 4) was studied by electrospray ionization tandem mass spectrometry. A characteristic fragment ion (R(1)R(2)R(3)N(+)X) resulting from halogen transfer was observed in collision-induced dissociation. A new mechanism for the intramolecular halogen transfer was proposed that involves a reactive intermediate, [amine/halonium ion]. A potential energy surface scan using DFT calculation for CH2-N bond cleavage process of protonated 2-bromo-N,N-dimethylethanamine supports the formation of this intermediate. The bromonium ion intermediate-involved halogen transfer mechanism is supported by an examination of the ion/molecule reaction between isolated ethylenebromonium ion and triethylamine, which generates the N-bromo-N,N,N-triethylammonium cation. For other halogens, Cl and I also can be involved in similar intramolecular halogen transfer, but F cannot be involved. With the elongation of the carbon chain between the halogen (bromine as a representative example) and amine, the migration ability of halogen decreases. When the carbon chain contains two or three CH2 units (n = 1, 2), formal bromine cation transfer can take place, and the transfer is easier when n = 1. When the carbon chain contains four or five CH2 units (n = 3, 4), formal bromine cation transfer does not occur, probably because the five- and six-membered cyclic bromonium ions are very stable and do not donate the bromine to the amine." @default.
• W1958433582 created "2016-06-24" @default.
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• W1958433582 date "2015-09-17" @default.
• W1958433582 modified "2023-10-14" @default.
• W1958433582 title "Intramolecular Halogen Transfer via Halonium Ion Intermediates in the Gas Phase" @default.
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• W1958433582 doi "https://doi.org/10.1007/s13361-015-1261-4" @default.
• W1958433582 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/26383734" @default.
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