Reactions with Hydrazidoyl Halides (V): Synthesis of Some Amidrazones, Hydrazides, Pyrazoles and Pyrazolo [3, 4-d] pyridazine Derivatives

2-Bromo (2'-benzofury)gloxal-2-aryhydrazones I reacted with nucleophiles displacing the bromide. Treatment of I with active methylene compounds yield the pyrazole derivatives VIII-XI. Compounds XII-XIV reacted with hydrazine to give pyrazolo (3, 4-dipyridazine derivative XIV-XIV. The structures of the products were assigned and confirmed on the basis of their elemental analysis and spectral data.