Mass spectral studies of 3,5-Diamino-1,2,4-thiadiazoles

The mass spectra and fragmentation mechanisms of some 5-alkyl(or aryl)amino-3-amino-, 5-amino-3- arylamino-, 3,5-bis(arylamino)-, 4- aryl-3-arylamino-5-imino-4,5-dihydro-, and 3-alkyl(or aryl)amino-4- aryl-5-arylimino-4,5-dihydro-1,2,4-thiadiazoles and those of a 3-amino- 4-aryl-5-imino-4,5-dihydro-1,2,4-thiadiazole are discussed. The study, based on the behaviour of isomers under electron impact, attempts to evaluate the usefulness of mass spectra in structure determination of variously substituted 3,5-diamino-1,2,4-thiadiazoles.