制备磁性胺基催化剂高效催化Knoevenagel缩合反应

摘要

Silica-encapsulated magnetic nanoparticles (MNPs) were modified by sulfonic acid groups under mild conditions to obtain magnetic solid sulfonic acid(MSA). A novel magnetic catalyst was prepared with N,N'-dimethyl-1, 2-ethanediamine(DMEDA) to catalyze the Knoevenagel condensation reaction with high yield. The catalytic cycle experiments showed that the MSA/ADMEDA catalyst can catalyze 5 cycles of reaction, and the deactivated catalyst after the reaction can be reused in the catalytic reaction after acidic washing/amine assembly. After being recycled,the catalyst can still maintain high catalytic performance.%在温和条件下将包裹二氧化硅的磁性纳米颗粒(MNPs)进行磺酸基修饰,得到磁性固体磺酸(MSA).并与N,N'-二甲基-1,2-乙二胺(DMEDA)制备了新型磁性催化剂,催化Knoevenagel缩合反应,产率较高.催化循环实验表明MSA/ADMEDA催化剂可以循环催化5次反应,并且反应后失活的催化剂经过酸性洗涤/胺组装之后可再次用于催化反应,经循环使用后,该催化剂仍保持较高得催化性能.