The reaction of benzenesulfenanilides with lewis acids: involvement of radical cation intermediates.
作者:Loris Grossi、Pier Carlo Montevecchi
DOI:10.1016/s0040-4020(01)91226-8
日期:1993.1
afford the radical cation intermediates 9a–c, some of which could be detected by e.p.r. spectroscopy. Thus, the 4′-methoxy substituted compound 1a gave the fairly persistent radical cation 9a. In contrast, the radical cation 9b, derived from the 4′-nitro substituted compound 4b, was not detected apparently because it decayed too rapidly forming the very stable radical cation 11b, intermediate in the formation
4'-取代的N-甲基苯硫基苯胺1a-c与路易斯酸(包括BF 3,AlCl 3和GaCl 3)反应,得到自由基阳离子中间体9a-c,其中一些可以通过电子光谱法检测。因此,4'-甲氧基取代的化合物1a给出了相当持久的自由基阳离子9a。相反,显然没有检测到衍生自4'-硝基取代的化合物4b的自由基阳离子9b,因为它分解得太快而形成非常稳定的自由基阳离子11b,这是重排硫化物10b形成的中间过程。。自由基中间体9a-c与环己烯反应,生成1,2-加合物4a-c,5和6,据信它们是由th离子7b或硫烷8a,c形成的。