Aqueous Synthesis of Bifunctional Mn Catalysts on Protonated Imidazolium Supports for Efficient CO ₂ Cycloaddition to Cyclic Carbonates

ABSTRACT We report sustainable manganese catalysts immobilized on protonated imidazolium matrixes via aqueous synthesis for efficient CO 2 conversion. These recyclable systems enable cyclic carbonate synthesis from epoxides and CO 2 with 85%–98% yields, leveraging synergistic Lewis's acid‐ionic site cooperation. The catalyst further demonstrates versatility in one‐pot cascade reactions, directly converting olefins/styrenes to cyclic carbonates through integrated epoxidation‐carbonation. Structural stability and retained activity over five cycles highlight practical viability. This work advances CO 2 utilization strategies through rational integration of transition metal catalysis and ionic activation, offering a green protocol for carbon capture and chemical synthesis.