Cycloaddition of CO2 to Epoxides Catalyzed by N-Heterocyclic Carbene (NHC)-ZnBr2 System under Mild Conditions
Xiang Liu, Changsheng Cao*, Yunfei Li, Pei Guan, Longguang Yang, Yanhui Shi*
*College of Chemistry and Chemical Engineering, Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, Jiangsu Normal University, Xuzhou, Jiangsu 221116, Email: yhshijsnu.edu.cn
X. Liu, C. Cao, Y. Li, P. Guan, L. Yang, Y. Shi, Synlett, 2012, 23, 1343-1348.
In a simple and convenient method, NHC/ZnBr2 catalyzes the coupling of CO2 with epoxides. This catalytic system exhibits excellent activity and selectivity in the cycloaddition reactions of CO2 to terminal epoxides. The reaction can even be carried out under partial CO2 pressure and gives carbonates in high yields.
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N-heterocyclic carbenes, NHC-CO2 adducts, carbon dioxide, epoxides, cyclic carbonates