title: Pyridazines. LI. Synthetic approaches to pyridazino(2,3-a)-1,3,5-triazines, a novel heterocyclic system.
mesh_terms: D009682:Magnetic Resonance Spectroscopy; D011724:Pyridazines / Q000138:chemical synthesis*; D013055:Spectrophotometry, Infrared; D014227:Triazines / Q000138:chemical synthesis*
chemical_list: D011724:Pyridazines; D014227:Triazines