The efficient conversion of CO₂ into value-added chemicals is of great importance. Herein, a type of transition metal-doped MCM-41 supported ionic liquids were synthesized, and efficiently used as catalysts for the effective carboxylative cyclization of propargylic alcohols and CO₂ into α-alkylidene cyclic carbonates. The supported catalyst Cu-MCM-41@ILTiCl₅ with a synergistic effect between the active copper sites and the anion could efficiently promote the carboxylative cyclization of propargylic alcohols and CO₂ in high to excellent yields. After the reaction, the catalyst could be easily separated from the reaction mixture by simple centrifugation, and then reused for six times without noticeable decrease in the catalytic activity.These findings may be useful for the rational design of novel highly active and efficient catalysts for the transformation of CO₂ into value-added α-alkylidene cyclic carbonates.

Graphical Abstract

An efficient protocol has been developed for producingα-alkylidene cyclic carbonates in excellent yields under cocatalyst- and solvent-free conditions by treating propargylic alcohols with carbon dioxide, promoted by Cu-MCM-41 supported ionic liquid catalyst.

中文翻译：

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在可重复使用的多相 Cu-MCM-41 负载离子液体催化剂上高效、便捷地将 CO2 转化为 α-亚烷基环状碳酸酯

_{将CO 2}有效转化为增值化学品非常重要。_{在此，合成了一类过渡金属掺杂的MCM-41负载离子液体，并有效地用作炔丙醇和CO 2}有效羧基环化成α-亚烷基环状碳酸酯的催化剂。负载型催化剂Cu-MCM-41@ILTiCl ₅具有活性铜位点与阴离子之间的协同作用，可有效促进炔丙醇与CO _{2的羧化环化}高至优异的产量。反应后，通过简单的离心，催化剂可以很容易地从反应混合物中分离出来，然后重复使用六次，催化活性没有明显下降。这些发现可能有助于合理设计新型高活性、高效的催化剂。 CO ₂转化为增值的α-亚烷基环状碳酸酯。

图形概要

我们开发了一种有效的方案，在 Cu-MCM-41 负载的离子液体催化剂的促进下，通过用二氧化碳处理炔丙醇，在无助催化剂和无溶剂的条件下以优异的产率生产 α-亚烷基环状碳酸酯。