been studied from aryl bromide and phenol/aryl disulfide/diselenide substrates. A series of unsymmetrical diaryl chalcogenides were accessedfrom aryl bromide and diaryl dichalcogenide precursors by using 2.5 equiv of potassium tert-butoxide in DMSO at 80 °C. Unsymmetrical diaryl ethers were also obtained by using phenol precursors at 40–45 °C. Aryl bromides with methyl, trifluoromethyl, methoxy and
Palladium-catalyzed coupling reactions of arylhalides and phenols are described employing the bulky and electron-rich MOP-type ligands. When K3PO4 was used as base and toluene as solvent, the catalyst system exhibited high efficiency for the coupling reaction of the activated arylhalides. When NaH was used as base and o-xylene as solvent, unactivated arylhalides can be used as substrates.
描述了使用大体积和富电子的MOP型配体进行的钯催化的芳基卤化物和苯酚的偶联反应。当将K 3 PO 4用作碱并且将甲苯用作溶剂时,该催化剂体系对于活化的芳基卤化物的偶联反应表现出高效率。当将NaH用作碱,将邻二甲苯用作溶剂时,可以将未活化的芳基卤化物用作底物。