任运来.锰催化芳香碳-氧键的还原断裂[J].分子催化,2016,30(5):401-408
锰催化芳香碳-氧键的还原断裂
Mn-Catalyzed Reductive Cleavage of Aromatic Carbon-Oxygen Bonds
投稿时间:2016-07-02  修订日期:2016-09-19
DOI:
中文关键词:  还原断裂  碳-氧键    催化
英文关键词:reductive cleavage  carbon-oxygen bond  manganese  catalysis
基金项目:河南省高校科技创新人才支持计划
作者单位E-mail
任运来* 河南科技大学 renyunlai@126.com 
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中文摘要:
      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 mol% Mn(OAc)2、3当量 LiAlH4、140oC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。
英文摘要:
      Manganese compounds were found to be effective to catalyze the reductive cleavage of carbon-oxygen bonds. To the best of our knowledge, no effective Mn-based catalyst was reported for this process. The reaction conditions were optimized by choosing dibenzofuran as the substrate, and the obtained optimum conditions were as follows: 5 mol% Mn(OAc)2, 3 equiv. LiAlH4, 140oC as the reaction temperature and THF as the solvent. The optimum conditions allowed a series of aromatic carbon-oxygen bonds to undergo the reductive cleavage. An addition of sodium methoxide was beneficial for the reaction of some substrates including diphenyl ethers. Preliminary mechanistic investigation suggests that the present reaction possibly undergoes a radical pathway.
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