Choline chloride-based deep eutectic solvents (DESs) exhibited remarkable activity in the cycloaddition of CO2 with propylene oxide (PO) in the absence of any additives under solvent- and metal-free conditions as well as recyclability.

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The use of coupled catalytic systems with ETMs facilitates the reaction process by transporting electrons from catalysts to the oxidant along a low-energy pathway and, finally, DBT was prone to oxidize to DBTO2.

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