Intramolecular photoinduced rearrangements via electron-transfer-induced, concerted bond cleavage and cation radical/radical coupling
作者:F. D. Saeva、D. T. Breslin、H. R. Luss
DOI:10.1021/ja00014a028
日期:1991.7
concerted bond cleavage has been observed in both a phenylanthracene and a phenylnaphthacene sulfonium salt derivative to produce a singlet phenylaryl cation radical/radical pair. Subsequent, cation radical/radical coupling produces photorearrangement, which appears to be a kinetic process due to the correlation of the product distribution with spin densities in the phenylaryl cation radical. In the phenylanthracene
在苯基蒽和苯基萘锍盐衍生物中均观察到分子内光致电子转移协同键断裂,以产生单线态苯芳基阳离子自由基/自由基对。随后,阳离子自由基/自由基偶联产生光重排,由于产物分布与苯芳基阳离子自由基中的自旋密度相关,这似乎是一个动力学过程。在苯基蒽衍生物中,也形成酰胺和硫化物产物,推测来自溶剂笼内从自由基到阳离子自由基的电子转移。光致电子转移/键断裂和自由基偶联的功效归因于键断裂的协同性质,芳基 π 系统与锍部分的紧密接近,