STRUCTURAL STUDIES ON MESOIONIC 1,2,3,4-THIATRIAZOLO-5-AMINIDES AND 1,2,3,4-THIATRIAZOLO-5-METHYLIDES BY NITROGEN AND CARBON NMR

N-15, N-14, C-13 and H-1 NMR data were used for the structural analysi s of seven 1,2,3,4-thiatriazoles with various exocyclic groups. Measur ements at various temperatures were carried out in order to study the behaviour of exocyclic groups. Some N-15-labelled compounds were prepa red to assist in the interpretation of the N-15 NMR spectra. The resul ts suggest that the investigated compounds exist in the cyclic structu re. Three of the investigated compounds have not been previously synth esized.