A series of 1, 8-diazabicyclo-[5.4. 0] undec-7-ene (DBU) based bifunctional protic ionic
liquids (DBPILs) were easily prepared by acid–base reactions at room temperature. They
were used to catalyze the cycloaddition reaction of CO2 with epoxides under mild
conditions. As a metal free catalyst, the best DBPIL showed a 92% yield of products within 6
hours at 30° C and 1 bar CO2 without any solvents and co-catalysts. It could afford
carbonates in good yields with broad epoxide substrate scope and CO2 from simulated flue …

Correction: Efficient transformation of CO2 to cyclic carbonates using bifunctional protic
ionic liquids under mild conditions - Green Chemistry (RSC Publishing) … a Beijing Key
Laboratory of Ionic Liquids Clean Process, Key Laboratory of Green Process and
Engineering, State Key Laboratory of Multiphase Complex Systems, Institute of Process
Engineering, Chinese Academy of Sciences, Beijing 100190, People's Republic of China …
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