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

详细信息    查看全文

• 作者：Zahra Abbasi^a ; Sobhan Rezayati^a ; ^{sobhan.rezayati@yahoo.com} ; Maryam Bagheri^a ; Rahimeh Hajinasiri^b
• 关键词：γ-Fe2O3 nanocatalyst ; Heterogeneous ; Catalyst ; Pechman condensation ; Ag supported
• 刊名：Chinese Chemical Letters
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：28
• 期：1
• 页码：75-82
• 全文大小：1242 K
• 卷排序：28

文摘

In this protocol, Ag supported on the hydroxyapatite-core–shell magnetic γ-Fe2O3 nanoparticles (γ-Fe2O3@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 °C. 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.