Reactions of Hydrazonoyl Halides 47 1 : Synthesis of Some New 2,3-dihydro-1,3,4-thiadiazoles, Triazolo[4, 3- a ]pyrimidines, and Pyrazolo[3, 4- d ]pyridazines with Expected Biological Activity.

2,3-dihydro-1,3,4-thiadiazoles, triazolino[4, 3- a ] pyrimidines , andpyrazolo [3, 4- d ]pyridazines were synthesized in good yields from reactions of hydrazonoyl halides with alkyl carbodithioates, pyrimidine-2-thione, and substituted prop-2-ene-1-one, respectively. All structures of the newly synthesized compounds were elucidated by elemental analysis, spectral data, and an alternative synthesis method. Some of the new compounds were tested towards bacteria and fungi. [ABSTRACT FROM AUTHOR]