Reaction of 1-decyl-2-methylimidazole (1) with linear bromoalkanes 2a, 2b in refluxing acetonitrile leads to the formation of quaternary bromide salts 3a, 3b in excellent isolated yields. Quaternary salts 3a, 3b were metathesized with KPF6 (4a), LiNTf2 (4b), LiBF4 (4c), or KOTf (4d) in water to form the ionic liquids 5a-5h in very good yields. These new ionic liquids are liquid at ambient temperature, immiscible with water, miscible with acetone and chloroform and thermally stable up to 350 °C.
1-癸基-2-甲基咪唑(1)与直链溴代烷(2a,2b)在回流乙腈中反应,形成季铵溴盐(3a,3b),收率良好。季铵盐(3a,3b)与KPF6(4a),LiNTf2(4b),LiBF4(4c)或KOTf(4d)在水中进行交换反应,形成离子液体(5a-5h),收率非常高。这些新的离子液体在常温下为液态,与水不相溶,与丙酮和氯仿相溶,并在350°C时具有热稳定性。