Ammonium salts based on nicotine proved to be highly efficient and recyclable catalysts for the synthesis of cyclic carbonates from epoxides and CO2 without the utilization of any organic solvent and any additives.

DABCO based ammonium salts immobilized on functionalized silica proved to be an effective heterogeneous catalyst for the synthesis of cyclic carbonate from epoxide and CO2 without the utilization of any organic solvent and any additives.

Silica‐supported L‐histidine efficiently catalyzes the solvent‐free reaction of epoxides from styrene and terminal alkenes with carbon dioxide to the cyclic carbonates in high yields.

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