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Mass spectrometry of quaternary ammoniohexanoates: Intermolecular alkyl transfer during field desorption
Author(s) -
Sanders R. A.,
DeStefano A. J.,
Keough T.
Publication year - 1980
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.1210150707
Subject(s) - adduct , chemistry , alkyl , desorption , intermolecular force , mass spectrum , ion , mass spectrometry , analytical chemistry (journal) , crystallography , molecule , organic chemistry , chromatography , adsorption
Intermolecular alkyl transfer occurs during field desorption of quaternary ammoniohexanoates, resulting in mass spectra containing structurally diagnostic adduct ions. Methyl, ethyl and propyl groups attached to nitrogen readily undergo intermolecular transfer to give [M+CH 3 ] + , [M+C 2 H 5 ] + and [M+C 3 H 7 ] + ions, respectively. Evidence is presented that alkyl groups even as large as C 10 H 21 can transfer intermolecularly at high emitter temperatures. In addition to the alkyl ion adducts, the field desorption spectra of \documentclass{article}\pagestyle{empty}\begin{document}$ {\rm C}_{10} {\rm H}_{21} \mathop {\rm N}\limits^ + \left({{\rm CH}_3 } \right)_2 \left({{\rm CH}_2 } \right)_5 {\rm COO}^ - $\end{document} show several other adduct and fragment ions whose relative intensities depend strongly on emitter current. The field desorption results are compared with earlier pyrolysis electron impact results on similar compounds.