The C

₃H₆O^+" fragment from 1,4-dioxane^+" revisited

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Eur. J. Mass Spectrom. 5, 147 - 150 (1999)

The C₃H₆O^+" fragment from 1,4-dioxane^+" revisited

R. Thissen
LPCR, Université Paris Sud, 91405 Orsay, France.
H.E. Audier, J. Chamot-Rooke and P. Mourgues
DCMR, UMR CNRS 7651, Ecole Polytechnique, 91128 Palaiseau, France.

ABSTRACT:

In the cell of a Fourier transform ion cyclotron resonance mass spectrometer, the reactions of C₃H₆O^+" (m/z 58) isomer ions CH₃OCHCH₂^+" (1) and ^"CH₂CH₂OCH₂⁺ (2) with selected neutral molecules serve to distinguish clearly between these structures. It is shown that, contrary to earlier assumptions, the m/z 58 ions formed by fragmentation of 1,4-dioxane^+" do not correspond to a single structure. The main component corresponds to structure 2, but structure 1 is also present to the extent of about 7%. The mechanism of fragmentation is discussed.

Keywords: 1,4-dioxane, distonic ions, methyl vinyl ether, isomeric ions, FT-ICR, ionmolecule reactions

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