Photolytic decomposition of some polycyclic α-diazoketones: generation and reactivity of 1,2-oxocarbenes in benzene with and without tert-butylamine
作者:Peter J. N. Brown、J. I. G. Cadogan、Ian Gosney、Alexander Johnstone、R. Michael Paton、Norman H. Wilson
DOI:10.1039/p29960002303
日期:——
detected and characterised by EPR spectroscopy. A reinvestigation of the photolytic decomposition of the related polycyclic α-diazoketone 5 under the same conditions has established that a more likely structure for the isolated dihydrofuran is 8, and not the reported isomeric dihydrofuran 20, which is formed from 8 by hydrogen migration during isolation by repeated thick-layer chromatography.
两种辐照的2,3-二重氮氟蒽酮11和14在苯中的辐照导致仅形成产物,这是因为中间氧羰基化合物正式插入到溶剂的CH键中,除非在存在下进行反应然后,得到叔丁胺的叔丁胺,然后也将氧卡宾明显[3 + 2]-环加成到溶剂中,即得到产物。二氢呋喃13和16。生成的氧碳烯的Wolff重排以产生衍生自叔丁烯酮中间体的直接捕集的产物没有观察到-丁胺。正式的插入产物2-苯基氟蒽-3-醇12(来自11)在硅胶色谱纯化过程中发生部分氧化,生成持久性自由基物质17,该自由基物质已通过EPR光谱法进行了检测和表征。在相同条件下,对相关多环α-重氮酮5进行光解分解的再研究表明,分离出的二氢呋喃的更可能结构为8,而不是报道的异构体二氢呋喃20,其是由8在分离过程中通过氢迁移形成的。通过重复的厚层色谱法。