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Oxidative carboxylation of cycloheptene under solvent free conditions

Alsaiari Raiedhah

Archives of Environmental Protection

2025

Vol. 51, no. 1

57--63

Efficient synthesis of cyclic carbonates is crucial due to their significant value in the chemical industry. A two-step procedure typically produces cyclic carbonates: first epoxidizing cycloheptene and then carboxylating it to form the cyclic carbonate. Combining these processes into a direct oxidative carboxylation reaction would be advantageous from an economic perspective, as it would eliminate the need for additional work-up procedures. Moreover, the effective capture and storage of CO2, a significant contributor to global warming, would also be very advantageous. This study examines the process of oxidative carboxylation of cycloheptene. Supported ruthenium catalysts facilitate the epoxidation step, while a mixture of tetrabutylammonium bromide and zinc bromide enables the cycloaddition of carbon dioxide in the second step. The study evaluates the performance of the catalysts work in both phases and finds that the cyclic carbonate is produced with good selectivity using a one-pot, two-step method.