An imidazolium-based ionic liquid (IL) functionalized zinc porphyrin catalyst was successfully synthesized for the first time, and was employed as an efficient catalyst for CO₂ transformation including both the chemoselective synthesis of cyclic carbonates from various epoxides and the regioselective synthesis of 5-aryl-2-oxazolidinones from N-substituted aziridines. Detailed studies demonstrated that the intramolecular cooperative effect between the coordinated zinc center (electrophile) and flexible bromine anions (nucleophile) could mediate these reactions effectively under solvent-free and mild conditions. More importantly, the IL-based catalyst could be readily recovered by solvent precipitation and reused with retention of high activity and selectivity more than ten times based on the concept of “one-phase catalytic coupling with two-phase separation”.

中文翻译：

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咪唑基离子液体修饰的锌卟啉锌催化剂，用于将CO ₂转化为五元杂环分子†

首次成功合成了咪唑类离子液体（IL）官能化锌卟啉催化剂，并被用作有效的CO ₂催化剂转化包括从各种环氧化物的化学选择性合成环状碳酸酯，以及从N-取代的氮丙啶类化合物选择性合成5-芳基-2-恶唑烷酮的区域选择性。详细的研究表明，在无溶剂和温和条件下，配位的锌中心（亲电子）与柔性溴阴离子（亲核试剂）之间的分子内协同作用可以有效地介导这些反应。更重要的是，基于“一相催化偶联两相分离”的概念，可以容易地通过溶剂沉淀回收基于IL的催化剂，并且可以保留十倍以上的高活性和选择性地重复使用。