室温离子液体催化合成碳酸丙烯酯

In the presence of room temperature ionic liquids based on 1 butyl 3 methylimidazolium salt and butylpyridinium salt, cycloaddition of propylene oxide and carbon dioxide without any additional organic solvents was investigated. It was found that both cations and anions of the room temperature ionic liquids have strong influence on the catalytic activity. The better catalytic performance was achieved with 1 butyl 3 methylimidazolium tetrafluoroborate as a catalyst. A suitable CO 2/propylene oxide molar ratio is needed for the reaction, and the conversion of propylene oxide increases with the increase of reaction temperature. The ionic liquid as a catalyst for such reaction can be recycled.