The behaviour of a number of deuterated imidazoles upon electron-impact has been studied. Loss of H' from the molecular ion occurs specifically at the 4(5)-position. Loss of HCN is less specific, the order being 2 > 4(5) > 1.

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[C,H,N]? ions generated from a number of different precursors have been studied by high kinetic energy ion-molecule reactions. It has been shown that at least four distinct stable species occur, of which acetonitrile and methyl isocyanide retain their original structure. With imidazole or pyrazole as precursors, a mixture of open chain radical cations, not identical to the above species and probably interconvertible via the 1H-azirine radical cation, is formed. From butyronitrile, pyrrole, crotonitrile, ally1 cyanide, methacrylonitrile and cyanocyclopropane a fourth species, probably the vinylidenimine ion, is formed

The mass spectra of aU isomers of methylnibopyrazoles are reported. Generally, the spectra are charactenstic of nitropyrazoles. In some cases however, o d o eñects occur, recognizable by primary losses of, for example,

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The mass spectra of six isomers of methylnitrobidazoles are reported and discussed. AM compounds exhiiit strong molecular ions, along with the characteristic fragmentations of aromatic nitro compounds. In some cases ortho effects-losses of OH', HzO, CHO', CHzO-are observed, due to interactions of adjacent substituents.