Carbon dioxide released annually to the atmosphere at ca. 30 000 Mt1 is also an attractive C1 feedstock as it is nontoxic, abundant, inexpensive. From the viewpoint of environmental protection and resource utilization, it is important to transform CO2 into cyclic carbonates efficiently not only in academia but also in industrial applications(Scheme 1). Many scientists have made a concentrated effort to improve the performance of the ionic liquids (ILs) catalysts during the past decade due to their tunable structures. Synergistic catalytic effects of ILs catalytic system play an important role of promoting the cycloaddition reactions of epoxides. However, due to the diversity of different anion¨Ccation combinations it is difficult to make generalizations about synergistic effects.
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