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Various off-the-shelf Lewis acids in conjunction with various onium salts are screened for coupling reaction of CO 2 with epoxides. Among the tested ones, VCl 3 /n-Bu4NOAC, VCl 3 /(n-Bu 4 NCl or PPNCl), FeCl 3 / n-Bu 4 NOAc, and AlCl 3 /n-Bu4NOAC are proved to be highly active. Propylene oxide, epichlorohydrin, styrene oxide, and cyclohexene oxide can be converted over 90% yields to the corresponding cyclic carbonates without the use of organic solvents under mild conditions by 0.1-1.0 mol% catalyst charge.

Coupling Reaction of CO2 with Epoxides by Binary Catalytic System of Lewis Acids and Onium Salts