An intermolecular synergistic catalytic system consisting of ionic liquids and organic bases is developed for the cycloaddition of CO₂ and epoxides. This strategy realizes the cycloaddition takes place under atmospheric pressure of CO₂ with high activity. NMR, FT-IR spectroscopy and DFT calculations are applied to investigate the synergistic effect and reaction mechanism on molecules. Plausible ionic liquids/secondary amines and ionic liquids/tertiary amines catalyzed mechanisms are proposed and further confirmed by more detailed DFT calculations including reaction pathways and energy profiles, respectively. The procedure reported here represents a facile, cost-effective and energy-efficient route for chemical fixation of CO₂ into 5-membered cyclic carbonates.

建立了由离子液体和有机碱组成的分子间协同催化体系，用于CO ₂和环氧化物的环加成反应。该策略实现了在高活性CO _2的大气压下进行环加成反应。核磁共振，傅立叶变换红外光谱和DFT计算用于研究分子的协同效应和反应机理。提出了可行的离子液体/仲胺和离子液体/叔胺催化的机理，并通过更详细的DFT计算（分别包括反应途径和能量分布）进一步证实了这一点。此处报告的程序代表了化学固定CO _2的便捷，经济高效且节能的途径 成五元环状碳酸酯