Synthesis and mass spectra of 2,3-dihydro-1H-1,5-benzodiazepine-2-thiones

2,3-Dihydro-1H-1,5-benzodiazepine-2-thiones and their N-methyl and S-methyl derivatives were synthesized. It was demonstrated by means of the IR, UV, PMR, and mass spectra that in solutions with different polarities 1,5-benzodiazepine-2-thiones exist primarily in the thione form; the thione and enamino-thiol forms are the most probable forms in the gas phase.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 3, pp. 396–400, March, 1990.