282SYNTHESIS OF NOVEL FUSED PYRAZOLO[4,3-d][1,2,3]TRIAZIN- 4-ONES: APPLICATION OF DIAZONIUM ION INDUCED HETEROCYCLISATION IN THE SYNTHESIS OF NOVEL HETEROCYCLESSynthesis of novel 10-chloro-3-methyl-1-n-propyl-4,5,7,12-tetrahydro-H-benzo[d]pyrazolo [3’, 5’: 5,6][1,2,3] triazino [1,2-a] [1, 2, 3] triazin-4, 12-dione (5) and 11-methyl-9-n-propyl-5,6,11,12-tetrahydro-8H-benzo[e] pyrazolo[4,׳3 :׳4, 5] [1, 2, 3] triazino [1,2-a] [1, 2, 3] triazin-5, 12-dione (11) by reacting 4-N-(2-amino-5-chlorobenzoyl)amino-1-methyl-3-npropylpyrazole-5-carboxamide (4) and 5-N-(2-carboxamidophenyl)-1-methyl-4-amino-3-n-propyl-1H-pyrazole-5-carboxamide (10) with sodium nitrite in hydrochloric acid respectively is reported.vasanthamgu@gmail.comResearch482013Tetracyclic,Pyrazole,Fused pyrazolo [4, 3d] [1, 2, 3] triazine,Diazotization,Cyclization,CharacterizationVasantha Mittapelli,Ram Reddy N,Pratap Reddy PDepartment of Chemistry, Mahatma Gandhi University, Anneparthy, Nalgonda – 508254, Andhra Pradesh, India, Department of Chemistry, Osmania University, Hyderabad – 500007, Andhra Pradesh, India., Department of Chemistry, Osmania University, Hyderabad – 500007, Andhra Pradesh, India.