Journal of Mass Spectrometry p. 893 - 899 (1995)
Update date:2022-08-30
Topics:
Drabner
Budzikiewicz
Under the conditions of negative-ion chemical ionization with O2 as a reagent gas [NCI(O2)], thiophene derivatives suffer surface-catalysed oxidative degradation with subsequent ionization of the resulting species. These degradation reactions are to some extent structure specific and thus may be used for the localization of rings and/or substituents. It is advisable, however, to combine NCI(O2) with either electron impact ionization or positive ion CI. The latter ionization methods yield abundant M+. ions but hardly any structure-specific fragments, whereas with NCI(O2) the determination of the molecular mass may be difficult owing to the competing oxidation reactions.
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