作者:Huang-Chuan Kan、Ming-Chung Tseng、Yen-Ho Chu
DOI:10.1016/j.tet.2006.12.003
日期:2007.2
conditions, among all tested ionic liquids the 5,5-membered [R-3C-im][NTf2] ionic liquids were most stable to solvent deuterium isotope exchange while the previously reported [bdmim][NTf2] ionic liquid was 50% deuterium exchanged at its C-2 methyl in 30 min at ambient temperature. Under identical condition, the commonly used [bmim][NTf2] ionic liquid was deuterium exchanged instantaneously at its C-2
我们先前曾报道过使用咪唑作为起始化合物来制备双环咪唑鎓离子液体[b-3C-im] [NTf 2 ],在四个合成步骤中分离出的总产率为29%。该新型室温离子液体显示出比常用的[bmim] [PF 6 ],[bdmim] [PF 6 ]和[bdmim] [NTf 2]。由于这种令人着迷的化学稳定性,它促使我们开发出一种更通用和高产率的合成方法,从而可以探索双环离子液体的分子多样性。在这项工作中,我们通过使用4-氯丁腈或5-氯戊腈作为起始原料,修改了先前的合成路线,并成功开发了一系列五步合成一系列新型双环咪唑基离子液体的方法,总分离产率为40-53%。我们研究了所有制备的双环离子液体的固有反应性,发现在强碱性条件下,在所有测试的离子液体中,5,5-元[R-3C-im] [NTf 2 ]离子液体对溶剂氘同位素最稳定交换,而先前报告的[bdmim] [NTf 2在室温下,离子液体在30分钟内以50%