Derivatives of three new classes of heterocyclic compounds have been synthesized. The first class comprises the synthesis of pyrimidino-and imidazolopyrazolopyridazine using 11 H-dibenzo [f, h] pyrazolo [3, 4-c]-cinnoline-13-amine. The second class involves the synthesis of triazine derivatives using 11 H-dibenzo-[f, h] pyrazolo [3, 4-c] cinnoline-13- diazonium chloride. The third class deals with the synthesis of polycyclic compounds ...