Benzylic Ligand Hydroxylation Starting from a Dicopper μ-η2:η2 Peroxo Intermediate: Dramatic Acceleration of the Reaction by Hydrogen-Atom Donors
作者:Malte Rolff、Jessica Nadine Hamann、Felix Tuczek
DOI:10.1002/anie.201102332
日期:2011.7.18
in directed pathways: The μ‐η2:η2 peroxo CuII2 intermediate 1 shows a much faster benzylic ligand hydroxylation than systems without phenol. This novel reactivity can be further accelerated by addition of external H‐atom donors such as TEMPO‐H. The results imply initial H‐atom transfer leading to the formation of phenoxyl radicals. A highly reactive copper oxyl intermediate is then formed, which inserts
自由基在定向途径:μ-η 2:η 2过氧铜II 2中间体1示出了一个快得多的苄型配体的羟基化比没有苯酚的系统。通过添加外部H原子供体(例如TEMPO-H)可以进一步加速这种新型反应性。结果表明最初的H原子转移导致苯氧基自由基的形成。然后形成高反应性的铜氧基中间体,该中间体将氧插入苄基的CH键中。