Exploring the CO2 utilization: Efficient Cycloaddition to Styrene Oxide Mediated by Manganese Porphyrin Catalysts

The chemical fixation of CO₂ into epoxides represents a crucial strategy for carbon capture and utilization, transforming a greenhouse gas into high-value cyclic carbonates. This study investigates the catalytic conversion of styrene oxide into styrene carbonate using manganese(III) porphyrins as homogeneous catalysts. The reaction was performed under mild conditions (23 or 40 °C, 1 bar CO₂), utilizing tetrabutylammonium bromide as a co-catalyst. The system demonstrated high efficiency and selectivity, promoted by the metal center's ability to activate the epoxide ring for CO₂ insertion. The results highlight the potential of manganese porphyrins as robust, biomimetic platforms for the synthesis of fine chemicals from CO₂. This approach offers a sustainable pathway for carbon valorization, aligning with the principles of green chemistry and the development of efficient catalytic processes for environmental remediation.