Table 2.

Cycloaddition ^a of CO₂ to styrene epoxide in different ionic liquids.

Entry	Ionic Liquid	Styrene Carbonate Yield/% b
1	[emim][N(CN)2]	0.3
2	[bmim][N(CN)2]	4.9
3	[emim][Cl]	0.5
4	[bmim][Cl]	1.6
5	[emim][NTf2]	0.1
6	[bmim][NTf2]	0.3

^a Reaction conditions: styrene epoxide (5 mmol), [Bu₄N]Br (0.3% mol vs. epoxide), IL (2.5 mL), CO₂ (8 bar), 24 h, 80 °C. ^b Yield determined by ¹H NMR (internal standard method).