The structure of [C3H4N2]+· and [C5H5N2]+ ions formed from vinylimidazoles,studied by collisionally activated dissociation mass spectrometry |
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Authors: | M. W. E. M. Van Tilborg J. J. Van Houte J. Van Thuijl |
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Abstract: | Mass spectra of the three isomeric vinylimidazoles have been compared and the structures of the fragment ions [C3H4N2]+· and [C5H5N2]+ 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. |
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