Experimental
Representative Procedure for Carbonates Synthesis from Cs2CO3. A mixture of cinnamyl alcohol (67.1 mg, 0.5 mmol), Cs2CO3 (325.8 mg, 1 mmol) and 1-n-butyl-3-methylimidazolium hexafluorophosphate (bmimPF6) (0.1 mL) in dibromomethane (1 mL) was equipped with a seal tube and stirred for 18 h at 70 ℃. The reaction mixture was evaporated and purified by flash column chromatography (silica gel) (2% Ether/hexane) to obtain dicinnamyl carbonate (1) 69.0 mg (94%).
Representative Procedure for Synthesis of Low-molecular-weight Carbonates (DMC and DEC). A mixture of methanol (16.0 mg, 0.5 mmol), Cs2CO3 (325.8 mg, 1 mmol), 1-n-butyl-3-methylimidazolium hexafluorophosphate(bmimPF6) (0.1 mL) and tetradecane (19.8 mg, 0.1 mmol) in dibromomethane (1 mL) was equipped with a seal tube and stirred for 18 h at 70 ℃. The yield was determined by GC analysis of the reaction mixture using tetradecane as an internal standard; average of three runs.
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