Mass spectrometry of heterocyclic compounds. VII—Evidence for common structure(s) of 1,2-benzisothiazole and benzothiazole molecular ions produced by electron-impact

1,2-Benzisothiazole and benzothiazole ion kinetic energy spectra, and metastable ion relative abundances of the same primary and secondary decomposition processes are compared. The results are interpretable as postulating slow (metastable) process(es) involving common structures and fast process(es)which are structurally dependent. Analogous indications are given by the interring H/D scrambling data, preceding the loss of DCN (or HCN) from 1,2-benzisothiazole-3-d₁ and benzothiazole-2-d₁ molecular ions, measured in either metastable or normal daughter ions at various electron beam energies.