Silicates as Latent Alkyl Radical Precursors: Visible‐Light Photocatalytic Oxidation of Hypervalent Bis‐Catecholato Silicon Compounds
作者:Vincent Corcé、Lise‐Marie Chamoreau、Etienne Derat、Jean‐Philippe Goddard、Cyril Ollivier、Louis Fensterbank
DOI:10.1002/anie.201504963
日期:2015.9.21
This works introduces hypervalent bis‐catecholato silicon compounds as versatile sources of alkyl radicals upon visible‐light photocatalysis. Using Ir[(dF(CF3)ppy)2(bpy)](PF6) (dF(CF3)ppy=2‐(2,4‐difluorophenyl)‐5‐trifluoromethylpyridine, bpy=bipyridine) as catalytic photooxidant, a series of alkyl radicals, including highly reactive primary ones can be generated and engaged in various intermolecular
这项工作介绍了高价双邻苯二酚硅化合物作为可见光光催化时烷基自由基的通用来源。使用Ir [(dF(CF 3)ppy)2(bpy)](PF 6)(dF(CF 3)ppy = 2-(2,4-二氟苯基)-5-三氟甲基吡啶,bpy = bipyridine)作为催化光氧化剂,可以产生一系列的烷基,包括高反应性的伯基,并参与各种分子间的均解反应。在循环伏安法,斯特恩-沃尔默研究的基础上,并在计算的支持下,提出了一种机制,该机制涉及从硅酸盐到光活化铱配合物的单电子转移。这种氧化光催化过程可以有效地与镍催化的C merge合并C交叉偶联反应。