ABSTRACT The direct oxidative carboxylation of olefins and CO 2 is a green and effective route to synthesize cyclic carbonates. Therefore, developing catalysts capable of efficient catalytic activity under relatively mild conditions is of great importance. In this work, two structurally identical two‐dimensional metal‐organic frameworks, nickel‐catecholate (Ni‐CAT) and cobalt‐catecholate (Co‐CAT), were synthesized at ambient temperature using water as solvent, thereby avoiding the energy consumption associated with high‐temperature synthesis and the environmental pollution caused by organic solvents. Both catalysts exhibited excellent catalytic performance. Through the combination of catalytic activity evaluation, kinetic studies, and structural characterizations, it was demonstrated that Lewis acidic amounts had a beneficial effect on the CO 2 cycloaddition step but a detrimental influence on the olefin epoxidation reaction. Using Ni‐CAT as the catalyst under mild conditions (80°C, 0.1 MPa CO 2 , 10 h, solvent‐free), styrene (ST) conversion and ST carbonate yield reached 99% and 90%, respectively. Furthermore, after five reaction cycles, the catalytic activity of Ni‐CAT and Co‐CAT showed no significant decline. Finally, based on these characterization and experimental results, mechanisms for this catalytic reaction were proposed.
Wang et al. (Thu,) studied this question.
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