Preparation of 5-methyl-3,5-dipropyl-2-pyrazoline catalyzed by chloroaluminate ionic liquids
作者:Jinyu Chang、Yuan Yao、Yangfeng Xia、Long Liu、Yanqiang Zhang
DOI:10.1016/j.molstruc.2022.132539
日期:2022.5
an intermediate for the preparation of new high energy fuels. In this paper, chloroaluminate ionic liquids ([Bmim]Cl-xAlCl3, x = 1, 1.2, 1.4, 1.6, 1.8, 2.0) were applied as green catalysts for the synthesis of 5-methyl-3,5-dipropyl-2-pyrazoline through the intramolecular cyclization reaction of 2-pentyl ketazine. The effects of temperature, acidity and dosage of ionic liquids on the cyclization reaction
5-甲基-3,5-二丙基-2-吡唑啉是制备新型高能燃料的中间体。本文将氯铝酸盐离子液体([Bmim]Cl-xAlCl 3 , x = 1, 1.2, 1.4, 1.6, 1.8, 2.0)作为绿色催化剂用于合成5-甲基-3,5-二丙基-2 -吡唑啉通过2-戊基酮嗪的分子内环化反应。详细研究了温度、酸度和离子液体用量对环化反应的影响,在110 ℃、[Bmim]Cl-1.6AlCl 3和10% 2-戊基酮嗪的条件下催化性能最高。通过理论模拟,提出了可能的催化机制为Al([Bmim] +AlCl 4 - ) 和N1原子,增加N2原子的电荷,从而提高其亲核性,并进一步使其与甲基发生分子内加成反应。本研究将为5-甲基-3,5-二丙基-2-吡唑啉的绿色制备提供指导。