Ketyl Radicals Formed in Grignard Reaction. IV. Sterically Hindered Ketyl Radicals in Nuclear Replacement and Conjugate Addition
作者:Masao Okubo
DOI:10.1246/bcsj.50.2379
日期:1977.9
chloride was examined by means of ESR measurements. Both the original and the “replaced” ketyl radicals were identified, and an electron-transfer mechanism similar to that of SRN−-type reactions was proposed. Some sterically hindered αβ-enones were also found to form detectable amounts of ketyl radicals. The factors governing the production ratio of the normal and the conjugate adduct were discussed
2,3,5,6-四甲基二苯甲酮上的 4'-甲氧基和 4'-氰基取代基被苄基-和叔-丁基氯化镁有效取代的反应通过 ESR 测量进行了检查。原始和“替代”的羰基自由基都被识别出来,并提出了一种类似于 SRN-型反应的电子转移机制。还发现一些空间位阻αβ-烯酮形成可检测量的酮基自由基。讨论了控制正态加合物和共轭加合物生成比的因素。