Electrophilic Arene Hydroxylation and Phenol OH Oxidations Performed by an Unsymmetric μ-η1:η1-O2-Peroxo Dicopper(II) Complex
作者:Isaac Garcia-Bosch、Xavi Ribas、Miquel Costas
DOI:10.1002/chem.201102372
日期:2012.2.13
affording biphenol coupling products, which is indicative that reactions occur through formation of phenoxyl radicals that then undergo radical CC coupling. Spectroscopic UV/Vis monitoring and kinetic analysis show that reactions take place through reversible formation of ground‐state association complexes [CuII2(μ‐η1:η1‐O2)(X‐PhOH)(m‐XYLN3N4)]2+ (1 O2⋅X‐PhOH) that then evolve through an irreversible
的非对称的亚铜反应(II)过氧化氢络合物[铜II 2(μ-η 1:η 1 -O 2)(间- XYL N3N4)] 2+(1 O 2,其中,米-Xyl是heptadentate N基描述了具有酚盐和酚的配体。络合物1 O 2在−90°C下与p ‐X‐PhONa(X = MeO,Cl,H或Me)反应,执行类似酪氨酸酶的邻位酶芳环的羟基化得到相应的邻苯二酚产物。机制研究表明,发生通过初始可逆形成准稳定缔合物的反应物[Cu II 2(μ-η 1:η 1 -O 2)(p -X-PHO)(间- XYL N3N4)] +(1 O 2 ⋅ X-PhO),然后通过过氧化物部分使芳环进行邻羟基化。复杂1分O 2也与发生反应4-X-取代的酚对- X-PhOH(X =的MeO中,Me,F,H或Cl),并用2,4-二-叔丁基苯酚在-90℃下引起的快速衰减1 O 2和得到双酚偶联产物,这表明发生通过形成苯氧自由基,然后进行自由基的C反应