An easily prepared novel dual-ionic liquid system was developed for cyclic carbonate synthesis from carbon dioxide and epoxides under mild conditions (1 atmos CO₂, T = 30–60 °C) with excellent yields in the absence of any solvents or additives. Moreover, after a simple separation the dual-ionic liquid system could be recycled six times with no loss of catalytic activity. The dual-ionic liquid system contained a functional carboxylate anion, a bromide anion and the N–H bond of the iminium ion, and they had an excellent synergistic catalytic effect on promoting the reactions.

中文翻译：

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双离子液体系统：在温和条件下将CO ₂化学固定为环状碳酸酯的有效催化剂

开发了一种易于制备的新型双离子液体系统，该系统可在温和条件下（1 atmos CO ₂，T = 30–60°C）由二氧化碳和环氧化物合成环状碳酸酯，并且在没有任何溶剂或添加剂的情况下具有优异的收率。而且，在简单分离之后，双离子液体系统可以循环使用六次，而不会损失催化活性。双离子液体系统包含功能性羧酸根阴离子，溴离子和亚胺离子的N–H键，它们在促进反应方面具有出色的协同催化作用。