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New hydrazinecarbothioamides 5a-d bearing 5H-dibenzo[a,d]an-nulene moiety  were synthesized using classical procedures. 1H-NMR analysis indicated the  existence of two conformational isomers, a major axial (about 75%) and a  minor equatorial one (25%) which are interconvertible by middle ring  inversion. Cyclization of 5a-d compounds in NaOH solution produced the  corresponding 1,2,4-triazoles-3(4H)-thiol 6a-d compounds which proved to be  pure axial isomers. All the new compounds were extensively characterized by  elemental analysis, IR-, UV-, 1H-NMR and 13C-NMR spectroscopy and biological  investigated using phytobiological tests

Synthesis and root growth activity of some new acetylhydrazinecarbothioamides and 1,2,4-triazoles substituted with 5H-dibenzo[a,d]annulene moiety