Scalable Main Group Mechanocatalytic CO ₂ Valorisation to Cyclocarbonate Species

Abstract Over the past two decades, main group elements have gained attention as promising substitutes for precious metals in catalytic processes. Additionally, mechanochemistry is emerging as a field with the potential to promote catalytic reactions under mild conditions. Herein, we report a scalable, main‐group mechanocatalytic synthesis of cyclic carbonates from both solid and liquid epoxides, using CO₂ as a renewable feedstock under mild conditions with a gallium aminotrisphenolate catalyst. Unlike solution‐based methods that generally require high temperatures and/or high CO₂ pressures, this mechanocatalytic process operates at just 1 bar and room temperature. The developed mechanochemical method affords the targeted compounds in high yields while also enabling efficient transformation of multi‐terminal epoxides and avoiding the conversion losses typically observed in solution. Furthermore, this scalable method outperforms solution‐based approaches across all green metrics, setting a new benchmark for environmentally friendly synthesis.