Synthesis and Biological Activity of 4-Aryl-1-benzalhydrazinophthalazines and 3,6-Diaryl-1,2,4-triazolo(3,4-a)phthalazines.

The derivatives (IVa) and (IVf) can alternatively be prepared in one step by reaction of the hydrazines (I) with PhCOOH/POCl3.