Polyhalogenoaromatic compounds. Part 43. Inter- and intra-molecular reactions of polychloroaromatic compounds with copper
作者:Arthur G. Mack、Hans Suschitzky、Basil J. Wakefield
DOI:10.1039/p19800001682
日期:——
The reaction of polychloroiodoarenes with copper in dimethylformamide gives good yields of the biaryls. 4Bromotetrachloropyridine gives products of halogen exchange and reduction as well as coupling. Pentachloropyridine gave only tetrachloropyridines. Evidence against free radical or pyridyne intermediates is presented, and it is postulated that the reactions proceed via pyridylcopper compounds, although
聚氯碘代芳烃与铜在二甲基甲酰胺中的反应产生了良好的联芳基收率。4Bromotetrachloropyridine产生卤素交换和还原以及偶合的产物。五氯吡啶仅给出四氯吡啶。提供了针对自由基或吡啶炔中间体的证据,并且假定反应通过吡啶基铜化合物进行,尽管不排除电子转移机理。与铜反应时,一些4-(邻-卤代苯氧基)-和4-(邻-卤代硫代苯氧基)四卤代吡啶吡啶产生环化,还原和卤素转移的产物。最初,铜至少部分与吡啶基反应,而不是与邻位反应。-卤代芳基。结果再次与涉及吡啶基铜中间体的反应途径一致。