Mass Spectrometry of Substituted 1,3-Dihydro-2H-imidazole-2-thiones

Article abstract of DOI:10.1002/oms.1210220405

The electron impact mass spectra of the 4-formyl-1,3-dihydro-2H-imidazole-2-thione, its six 1-methyl(n-propyl, n-hexyl)-3-methyl(phenyl)-disubstituted derivatives, and the 1,3-dihydro-1-phenyl-2H-imidazole-2-thione are discussed.The fragmentation pattern is strongly influenced by the alkyl or phenyl N-substituents, as well as by the length of the alkyl chain.The odd-electron ions containing an N-phenyl-substituent, but not a propyl or hexyl group, eject a hydrogen atom from the phenyl ring, while the presence of a long alkyl chain greatly enhances the loss of the sulphyhydryl radical and facilitates the expulsion of several alkenes, and alkyl and alkenyl radicals.