Sulfonated Core-Shell Magnetic Nanoparticle (Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub>@PrSO<sub>3</sub>H) as a Highly Active and Durable Protonic Acid Catalyst; Synthesis of Coumarin Derivatives through Pechmann Reaction
作者:Farhad Kabiri Esfahani、Daryoush Zareyee、Reza Yousefi
DOI:10.1002/cctc.201402547
日期:2014.12
Sulfonic acid supported silica coated magnetic nanoparticles (Fe3O4@SiO2@PrSO3H), was prepared by using low cost precursors and a facile immobilization technique. The final catalyst, which was characterized by XRD, FT‐IR, vibrating sample magnetometer (VSM), TEM, and TGA techniques, was found to be an efficient and environmentally benign solid acid for the Pechmann condensation of substituted phenols
磺酸负载的二氧化硅涂覆的磁性纳米粒子(Fe 3 O 4 @SiO 2 @PrSO 3H)是通过使用低成本前体和简便的固定技术制备的。最终的催化剂以XRD,FT-IR,振动样品磁力计(VSM),TEM和TGA技术为特征,被发现是一种高效,环境友好的固体酸,可用于取代酚与乙酰乙酸乙酯的Pechmann缩合反应,从而产生香豆素衍生物的形成。反应后,可通过外部磁体轻松地分离催化剂,并重复使用22次,而不会显着降低催化效率。通过避免有毒的常规催化剂和溶剂,提出的催化体系为有效合成香豆素,简化操作和绿色反应提供了可重复使用的策略。