The cycloaddition of CO₂ to epoxides is an important reaction and has got increasing attention. In this work, a series of DBU-based ionic liquids (DILs) were synthesized via facile neutralization of superbase 1,8-Diazabicyclo[5.4.0]undec-7-ene (DBU) with corresponding hydrogen bond donor acids, such as D(−)-tartaric acid (TA), malic acid (MA) and succinic acid (SA). The DILs cooperated with ZnI₂ were first evaluated in detail for catalyzing the coupling reaction of CO₂ with propylene oxide (PO), and DIL-1 exhibited obviously enhanced catalytic activity under 80 °C, 3 MPa and solvent-free conditions. The effects of reaction parameters on the activity for propylene carbonate (PC) synthesis were thoroughly investigated, and a possible synergistic catalytic mechanism was proposed. The catalytic system reported here could be separated by simple centrifugation from the products after reaction and then reused efficiently. Moreover, the catalytic system showed the advantages of simple synthesis, high catalytic activity, low cost, and substrate versatility for CO₂ conversion to cyclic carbonates.

CO ₂与环氧化物的环加成反应是重要的反应，受到越来越多的关注。在这项工作中，通过用相应的氢键供体酸（例如D）轻松中和超碱1,8-二氮杂双环[5.4.0]十一碳-7-烯（DBU），合成了一系列基于DBU的离子液体（DIL）。（-）-酒石酸（TA），苹果酸（MA）和琥珀酸（SA）。首先详细评估了与ZnI ₂配合使用的DILs催化CO ₂的偶联反应环氧丙烷（PO）和DIL-1在80°C，3 MPa和无溶剂条件下表现出明显增强的催化活性。深入研究了反应参数对碳酸亚丙酯（PC）合成活性的影响，并提出了可能的协同催化机理。反应后，可通过简单的离心从产物中分离出此处报道的催化体系，然后进行有效的再利用。此外，该催化体系显示出合成简单，催化活性高，成本低以及底物通用性的优点，以将CO ₂转化为环状碳酸酯。