1,4-Hydroxybiradical Behavior Revealed through Crystal Structure−Solid-State Reactivity Correlations
作者:Dario Braga、Shuang Chen、Heather Filson、Lucia Maini、Matthew R. Netherton、Brian O. Patrick、John R. Scheffer、Carl Scott、Wujiong Xia
DOI:10.1021/ja039076w
日期:2004.3.1
Structure-reactivity correlations for triplet 1,4-hydroxybiradicals in solution are made difficult by the presence of multiple reactive conformers and the possibility of conformation-dependent intersystem crossing. These problems can be overcome by working in the crystalline state, where the conformations of the 1,4-hydroxybiradicals are fixed and determinable by X-ray crystallography of the parent
由于存在多个反应性构象异构体和构象依赖性系统间交叉的可能性,溶液中三联体 1,4-羟基双自由基的结构-反应性相关性变得困难。这些问题可以通过在结晶状态下工作来克服,其中 1,4-羟基双自由基的构象是固定的,并且可以通过母体酮的 X 射线晶体学确定,假设氢原子提取发生而构象几乎没有变化或没有变化。这种方法应用于 15 种双环和三环酮,其双自由基构象略有不同,因此可以测试几何形状的微小变化和增量变化对双自由基行为的影响。结果表明,虽然几何形状确实对 1,4-羟基双自由基在环化、裂解、