... J. Chem. Research (S), 1997, 236–237 J. Chem. Research (M), 1997, 1576–1594 The Utility of Phosphonium Ylides in Heterocyclic Synthesis: Synthesis of Pyridazinone and Tetrahydrocinnolinone Derivatives Afaf Aly Nada,*a Ayman Wahba Erian,b Nadia Ragab Mohameda and Asma Mohamed Mahrana aNational Research Centre, Dokki, Cairo, Egypt bDepartment of Chemistry, Faculty of Science, Cairo University, Giza, Egypt ...