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[C 6 H 6 , C 3 H 7 + ]and [C 6 H 7 + , C 3 H 6 ] ion‐neutral complexes intermediate in the reactions of protonated propylbenzenes
Author(s) -
Berthomieu Dorothée,
Audier Henri,
Denhez JeanPierre,
Monteiro Candida,
Mourgues Philippe
Publication year - 1991
Publication title -
organic mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.475
H-Index - 121
eISSN - 1096-9888
pISSN - 0030-493X
DOI - 10.1002/oms.1210260417
Subject(s) - ion , protonation , kinetic energy , metastability , chemistry , dissociation (chemistry) , mass spectrum , analytical chemistry (journal) , benzene , crystallography , physics , organic chemistry , chromatography , quantum mechanics
From the mass‐analysed ion kinetic energy spectra of labelled ions, kinetic energy releases and thermodynamic data, it is proved that protonated n ‐propylbenzene (1) isomerizes into protonated isopropyl benzene (2). It is also shown that the dissociation of the less energetic metastable ions of (2), leading to [iso‐C 3 H 7 ] + and [C 6 H 7 ] + product ions, is preceded by H exchange. This H exchange involves two interconverting ion‐neutral complexes [C 6 H 6 , iso‐C 3 H 7 + ] (2π) and [C 6 H 7 + , C 3 H 6 ] (2α).