A zeolite supported Brønsted-acid catalyst system has been developed using different Brønsted-acid ionic liquids supported on ZSM-5 zeolite. Catalytic activity was tested via aqueous-mediated ultrasound-promoted synthesis of novel N-substituted spiro heterocycles, which does not take place under conventional conditions. The yield of the desired products was increased in the presence of ultrasonication compared to those of conventional and MW techniques. In the presence of ultrasonication, the recyclability of this novel catalyst system was studied. There was no loss of catalytic activity up to five cycles whereas a significant loss was observed in the presence of MWs.
利用 ZSM-5
沸石支撑的不同布氏酸
离子液体,开发了一种
沸石支撑布氏酸催化剂系统。通过
水介导超声促进合成新型 N-取代螺杂环测试了催化活性。与传统技术和 MW 技术相比,在超声作用下所需产物的产率有所提高。在超声作用下,对这种新型催化剂体系的可回收性进行了研究。催化活性在五个循环周期内都没有损失,而在存在 MWs 的情况下则出现了明显的损失。