OICC Press Iranian Journal of Catalysis 2345-4865 4 2 2024 02 03 Ionic liquids as efficient catalysts for synthesis of phosphorylated dialkyl succinates containing phthalazin-1-one moieties EN Ziba Tavakoli Department of Chemistry, Islamic Azad University, Science and Research Branch, Ponak Tehran, Iran. Elnaz Ghasemi Department of Chemistry, Islamic Azad University, Science and Research Branch, Ponak Tehran, Iran. Issa Yavari Department of Chemistry, Tarbiat Modares University, PO Box 14115-175, Tehran, Iran. Journal Article 2024 02 03 Ionic liquids such as 1,3-dialkylimidazolium salts make excellent catalysts and solvents for synthesis of dialkyl 2-(dialkoxyphosphoryl)-3-(1-oxo-1-H-phthalazin-2-yl)succinates from 2H-phthalazin-1-one, dialkyl acetylenedicarboxylates, and trialkyl phosphites. Under similar conditions, triphenyl phosphite led to dialkyl 2-(diphenoxyphosphoryl)-3-(1-oxo-1-H-phthalazin-2-yl)succinates. The ionic liquid was readily recycled and can be reused four times without significant loss of activity or mass.