Mass spectra of some 1,3, 4-thiadiazole derivatives

Abstract

Mass spectral fragmentation of some 2-aryl-amino-5-alkyl-1,3,4-thiadiazoles and 2-alkyl-6-arylimidazo[2,1-b]-2,3,4-thiadiazoles have been studied with the help of high resolution and metastable ion spectra. McLafferty rearrangement involving the gamma-hydrogen transfer from the alkyl chain dominates the mass spectra of many of the compounds. Preferable cleavage of C-C bond between C-2 and C-3 of the alkyl chain is also observed