2.2. Synthesis of 1-Butyl-3-Methylimidazolium Bromide

A three-necked flask equipped with a magnetic stirring bar was charged with 1-methylimidazole (0.1 mol) and 1-bromobutane (0.11 mol) during synthesis under a nitrogen atmosphere. The synthesis was carried out by conventional and microwave heating. The mixture was heated to 80 °C under constant stirring. After completion of the reaction, the unreacted reactants were removed on a rotary evaporator under reduced pressure at a temperature up to 80 °C. Subsequently, the product was shaken with 5 × 25 mL of diethylether. The obtained IL was dried in a 1 mbar vacuum at 70–80 °C for 5–6 h.