title: [Intramolecular cyclization of 3,6-dichloro-4-(o-nitrophenyl)pyridazine in triethyl phosphite].
mesh_terms: D055598:Chemical Phenomena; D002621:Chemistry; D003500:Cyclization; D009943:Organophosphorus Compounds; D011724:Pyridazines
chemical_list: D009943:Organophosphorus Compounds; D011724:Pyridazines