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A standard procedure for recording and correcting collisionally activated dissociation mass spectra is proposed, and used to distinguish between the C4H5N+˙ions formed from hydroxy‐ and amino‐pyridines after loss of CO and HCN, respectively. It is concluded that these ions are cyclic. From the 4‐isomers the 3H‐pyrrole ion is formed whereas from 2‐hydroxypyridine the 1H‐pyrrole ion is formed. In the other cases, mixtures of 2H‐ and either 1H‐ or 3H‐pyrrole ions are generated, depending on the nature of the precursor.
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Tilborg et al. (1983) studied this question.
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