Magnetically recyclable nano copper/chitosan in <i>O</i>
-arylation of phenols with aryl halides
作者:Seyed Ali Mousavi Mashhadi、Mohamad Z. Kassaee、Esmaiel Eidi
DOI:10.1002/aoc.5042
日期:——
Interaction of chitosan (CS) with Fe3O4, followed by embedding Cu nanoparticles (NPs) on the magnetic surface through adsorption of Cu2+, and its reduction to Cuo via NaBH4, offers a reusable efficient catalyst (Fe3O4/CS‐Cu NPs) that is employed in cross‐coupling reactions of arylhalides with phenols, which affords the corresponding diaryl ethers, with good to excellent yields. The catalyst is completely
壳聚糖(CS)与Fe 3 O 4相互作用,然后通过吸附Cu 2+将Cu纳米颗粒(NPs)嵌入磁性表面,并通过NaBH 4还原为Cu o,提供了可重复使用的高效催化剂(Fe 3 O 4 / CS-Cu NPs)用于芳基卤化物与苯酚的交叉偶联反应,可制得相应的二芳基醚,收率好至极好。通过使用外部磁体,可以从反应混合物中完全回收催化剂。它可以重复使用四次,而不会明显降低其催化活性。
Copper-catalyzed <i>O</i>-arylation of phenols with diazonium salts
作者:Xin Fang、Chengning Qi、Xiangqian Cao、Zhi-Gang Ren、David James Young、Hong-Xi Li
DOI:10.1039/d3gc02541a
日期:——
It is well known that diazonium salts (ArN2+) react with phenols (Ar′OH) to give aryl diazoethers or diazo compounds, but their cross-coupling to exclusively access diaryl ethers is challenging. Herein we disclose the Cu-catalyzed etherification of phenols with aryl diazonium salts at room temperature, yielding diaryl ethers in moderate to excellent yields. The advantages of this protocol are mild
We have developed a simple and direct method for the synthesis of diaryl ether under mild reaction conditions using an oxygen bridged bimetallic CuMoO4 nanocatalyst. The catalyst tolerated a wide range of substrates with various functional groups. The catalyst is efficient and recyclable. This methodology allowed easy access to nitrofen derivatives (herbicides) from unactivated 2,4-dichlorophenol,