Ir, PMR and 13C-NMR spectral studies of 2-mercaptobenzothiazole, 2-mercapt obenzimidazole, and 2-mercaptobenzoxazole derivatives

The prototropic tautomerism of compounds I, II and III was studied as a mean of distinguishing thiones from thiols. Several 2-mercaptobenzothiazole, 2-mercaptobenzimidazole and 2-mercaptobenzoxazole derivatives were studied in solution by PMR and 13C-NMR and, in the solid state, by IR spectra