Preparation of a novel, efficient, and recyclable magnetic catalyst,γ-Fe2O3@HAp-Ag nanoparticles, and a solvent- and halogen-free protocol for the synthesis of coumarin derivatives

作     者：Zahra Abbasi Sobhan Rezayati Maryam Bagheri Rahimeh Hajinasiri 

作者机构：Young Researchers and Elite Club Ilam Branch Islamic Azad University Ilam Islamic Republic of Iron Chemistry Department Qaemshahr Branch Islamic Azad University PO BOX 163 Qaemshahr Islamic Republic of Iran 

出 版 物：《Chinese Chemical Letters》 (中国化学快报（英文版）)

年 卷 期：2017年第28卷第1期

页      面：75-82页

核心收录：

学科分类：081705[工学-工业催化] 07[理学] 070205[理学-凝聚态物理] 08[工学] 0817[工学-化学工程与技术] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：the National Elites Foundation of Iran 

主　　题：γ-Fe2O3 nanocatalyst Heterogeneous Catalyst Pechman condensation Ag supported 

摘      要：In this protocol, Ag supported on the hydroxyapatite-core–shell magnetic γ-Fe2O3nanoparticles（γFe2O3@HAp-Ag NPs） as a novel, efficient, and magnetically recyclable catalyst is synthesized, and characterized by transmission electron microscopy（TEM）, scanning electron microscopy（SEM）, Fourier transform infrared spectroscopy（FT-IR）, X-ray diffraction（XRD）, and vibrating sample magnetometry（VSM）. The use of the catalyst is described in the synthesis of coumarin derivatives by the Pechmann condensation of various phenols with β-ketoesters under solvent- and halogen-free conditions at 80℃.This novel and inexpensive method offers advantages, such as recyclability simple experimental protocol, short reaction time, minimal work-up procedure, and excellent yields of products, together with desirable, eco-friendly, green aspects by avoiding toxic elements and solvents, and ease of recovery from the reaction mixture using an external magnet.