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这里发现锰化合物能够催化芳香碳-氧键的还原断裂.就我们所知,目前还没有锰催化芳香碳-氧键断裂方面的报道.以二苯并呋喃为底物,对各种反应条件进行优化,得到的较佳反应条件为5%Mn(OAc)_2,3当量LiAlH 4,140℃温度,四氢呋喃溶剂.在这个反应条件下,多种芳香碳-氧键能够发生还原断裂.甲醇钠的添加能够有效地促进二苯醚等底物的反应.对反应机理进行了初步研究,结果表明反应可能经历自由基过程.
It has been found here that manganese compounds are capable of catalyzing the reductive cleavage of aromatic carbon-oxygen bonds. To our knowledge, there are no reported manganese-catalyzed aromatic carbon-oxygen bond cleavages. With dibenzofuran as a substrate, various reaction conditions The optimal reaction conditions are as follows: 5% Mn (OAc) 2, 3 equivalents of LiAlH 4, temperature of 140 ℃, tetrahydrofuran solvent.A variety of aromatic carbon-oxygen bonds can be reductively broken under this reaction condition.The addition of sodium methylate can Effectively promote the reaction of diphenyl ether and other substrates.A preliminary study of the reaction mechanism showed that the reaction may experience free radical process.