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The structure of [C 3 H 4 N 2 ] +· and [C 5 H 5 N 2 ] + ions formed from vinylimidazoles, studied by collisionally activated dissociation mass spectrometry
Author(s) -
Van Tilborg M. W. E. M.,
Van Houte J. J.,
Van Thuijl J.
Publication year - 1984
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.1210190105
Subject(s) - imidazole , ion , mass spectrum , chemistry , dissociation (chemistry) , nitrogen , crystallography , mass spectrometry , ring (chemistry) , polyatomic ion , stereochemistry , organic chemistry , chromatography
Mass spectra of the three isomeric vinylimidazoles have been compared and the structures of the fragment ions [C 3 H 4 N 2 ] +· and [C 5 H 5 N 2 ] + have been investigated by collisionally activated dissociation mass spectrometry. The greater part of the non‐decomposing ions m / z 68 from 2‐vinylimidazole and from 2‐imidazolecarboxylic acid methyl ester, and a minor part of this ion formed from the free acid, all have the same structure: the imidazole ring system, with hydrogens at both nitrogen atoms but none at C(2). An analogous structure, with an ethyl group at C(2), is proposed for the m / z 93 ion from 2‐vinylimidazole.