The preparation of 1-alkenyl-3-methylimidazolium trifluoromethanesulfonates under solvent-free conditions.
| Entry | ILs | Condition (°C, min) | Yielda (%) | ||
|---|---|---|---|---|---|
| Step 1 | Step 2 | MWb | Δc | ||
| 1 | [AMIm]OTf | 100, 20 | 100, 15 | 90 | 78 |
| 2 | [ButMIm]OTf | 100, 20 | 100, 15 | 88 | 72 |
| 3 | [PentMIm]OTf | 100, 20 | 100, 30 | 89 | 68 |
a
Isolated yield.
b
Microwave heating: the reaction was performed in closed vessels using a CEM Discover monomode oven with strict control of pressure and temperature (power 10 W).
c
Conventional heating: the reaction was performed in a thermostat-controlled oil bath.