Reactions with Hydrazonoyl Halides 341: Synthesis of Some New 2,3-Dihydro-1,3,4-thiadiazoles

Hydrazonoyl halides 4a–h have been caused to react with each of alkyl carbodithioates (3, 13–17)a,b in the presence of triethylamine to give 2,3-dihydro-1,3,4-thiadiazoles in good yields. Structures of the new compounds were elucidated on the basis of elemental analyses, spectral data, and alternative methods of synthesis whenever possible.