Unimolecular Reactivity of Protonated α,ω-Alkanediamines in the Gas Phase - Archive ouverte HAL Access content directly
Journal Articles Journal of Physical Chemistry A Year : 2001

Unimolecular Reactivity of Protonated α,ω-Alkanediamines in the Gas Phase

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Abstract

Unimolecular deamination of protonated a,?-alkanediamines (1,2-ethanediamine (1), 1,3-propanediamine (2), 1,4-butanediamine (3), and 1,5-pentanediamine (4)) in the gas phase has been examined by tandem mass spectrometry experiments including metastable ions decompositions and collisional activation techniques and molecular orbital calculations up to the G2(MP2,SVP) level. For all the protonated molecules, only one unimolecular dissociation channel, leading to the formation of a protonated cyclic amine via an internal nucleophilic substitution, was detected. The hydride ion transfer from the a carbon to the ? position is not competitive with the internal nucleophilic substitution. This has been found to be the result of a large critical energy for this latter reaction.

Dates and versions

hal-00922238 , version 1 (27-12-2013)

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Cite

Guy Bouchoux, Nadège Choret, F. Berruyer-Penaud, Robert Flammang. Unimolecular Reactivity of Protonated α,ω-Alkanediamines in the Gas Phase. Journal of Physical Chemistry A, 2001, 105 (40), pp.9166-9177. ⟨10.1021/jp0115446⟩. ⟨hal-00922238⟩
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