It is very interesting to synthesize high value-added chemicals from CO under mild conditions with low energy consumption. Here, we report that a novel catalyst, Zn(betaine)Br, can efficiently promote the cycloaddition of CO with epoxides to synthesize cyclic carbonates under ambient conditions (30 °C, 1 atm). DFT calculations provide important insights into the mechanism, particularly the unusual synergistic catalytic action of Zn, Br and NR, which is the critical factor for the outstanding performance of Zn(betaine)Br. The unique features of the catalyst are that it is cheap, green and very easy to prepare.
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