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Abstract [C4H5N]+˙ ions have been generated from eleven neutral species. From a study of their metastable transitions and the translational energy released in the fragmentation in which C2H2 is lost, it is concluded that [C4H5N]+˙ ions with sufficient energy to decompose do so from a common structure or mixture of structures when they are generated from crotonitrile, allyl cyanide, cyclopropyl cyanide, methacrylontrile, pyrrole, 2‐, 3‐ and 4‐hydroxypyridines and 2‐aminopyridine. The [C4H5N]+˙ ions formed from allyl isocyanide decompose from a different structure and those given by cyclopropyl isocyanide appear to decompose from a mixture of the two structures. Non‐decomposing [C4H5N]+˙ ions were investigated by means of their collision induced decomposition spectra using a B/E linked scan. Six different structures or mixtures of structures are suggested to explain these observations.
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Sakurai et al. (1981) studied this question.
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