An efficient protocol using copper based reagents for the coupling of aryl halides with phenols to generate diaryl ethers is described. A copper(I) complex, [Cu(CH3CN)4]ClO4, or the readily available copper(II) source, CuCO3·Cu(OH)2·H2O (in combination with potassium phosphate), can be used. Aryl halides and phenols with different steric and electronic demands have been used to assess the efficiency of the procedure. The latter source of copper gives better yields under all conditions.
COMPOSITION FOR AGRICULTURAL USE FOR CONTROLLING OR PREVENTING PLANT DISEASES CAUSED BY PLANT PATHOGENS
申请人:Matsuzaki Yuichi
公开号:US20110009454A1
公开(公告)日:2011-01-13
Disclosed is a composition for agricultural use, which is used for controlling or preventing plant diseases caused by plant pathogens. The composition for agricultural use contains a compound represented by formula (1), a salt thereof or a hydrate of the compound or the salt. (1) [In the formula, Z represents an oxygen atom, a sulfur atom or NR
Z
; and E represents a furyl group, a thienyl group, a pyrrolyl group, a tetrazolyl group, a thiazolyl group, a pyrazolyl group, a phenyl group or the like.]
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
The first example of ligand-free copper-catalyzed O-arylation of nitroarenes with phenols was developed, achieving unsymmetrical diaryl ethers in moderate to excellent yields. This arylation proceeded smoothly without promotion of the ligands, and displayed great functional group compatibility. Thus, the method represents a new, facile, and cost-effective approach to access unsymmetrical diary! ethers. (C) 2012 Elsevier Ltd. All rights reserved.