铜双季铵盐蒙脱土催化卤代芳烃与氨水的偶联

Copper Montmorillonite Modified by Biquaternary Ammonium Salts for Coupling of Aryl Halides with Aqueous Ammonia

利用合成的两种不同联结基的双季铵盐修饰蒙脱土(MMT),并通过浸渍还原的方法将铜负载到双季铵盐MMT层间形成了两种铜双季铵盐MMT催化材料Cu-Q1-MMT和Cu-Q2-MMT.将这两种催化材料用于催化卤代芳烃与氨水偶联形成苯胺的反应.实验结果表明:两种催化剂均能在温和条件下,无需氮气保护,高活性和高选择性催化卤代芳烃与氨水反应生成伯胺.其中,Cu-Q2-MMT具有更高的催化活性,通过简单分离,能够重复使用17次而没有明显的活性下降.

Two kinds of different spacer biquaternary ammonium salts N1,N3-dibenzyl-2-hydroxy-N1,N1,N3,N3-tetramethylpropane-1,3-diaminium dichloride（Q1） and N1,N6-dibenzyl-N1,N1,N6,N6-tetramethylhexane-1,6-diaminium dibromide（Q2） were prepared to modify montmorillonite（MMT）.Copper was loaded on the modified MMT by the impregnation reduction method to form two kinds of catalytic materials Cu-Q1-MMT and Cu-Q2-MMT.They were applied to the coupling of aryl halides and aqueous ammonia.It was found that they were high active and selective catalysts for the coupling of aryl halides with aqueous ammonia under mild conditions without inert gas protection.Compared with Cu-Q1-MMT,Cu-Q2-MMT showed a higher catalytic activity.In addition,it could be separated easily and reused for 17 consecutive runs without significant loss in catalytic activity.