Photocatalytic hydroxylation of benzene to phenol by dioxygen (O₂) occurs under visible light irradiation of an O₂-saturated acetonitrile solution containing [Ru^II(Me₂phen)₃]²⁺ as a photocatalyst, [Co^III(Cp*)(bpy)(H₂O)]²⁺ as an efficient catalyst for both the water oxidation and benzene hydroxylation reactions, and water as an electron source in the presence of Sc(NO₃)₃. The present study reports the first example of photocatalytic hydroxylation of benzene with O₂ and H₂O, both of which are the most green reagents, under visible light irradiation to afford a high turnover number (e.g., >500). Mechanistic studies revealed that the photocatalytic reduction of O₂ to H₂O₂ is the rate-determining step, followed by efficient catalytic hydroxylation of benzene to phenol with H₂O₂, paving a new way for the photocatalytic oxygenation of substrates by O₂ and water.

中文翻译：

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在钴催化剂存在下，使用双氧作为氧源和水作为电子源将苯光催化氧化为苯酚

由分子氧（O苯光催化羟基化苯酚₂）的O的可见光照射下发生₂含有的[Ru -饱和乙腈溶液^II（ME ₂ phen）的₃ ] ²⁺作为光催化剂，[CO ^III（CP *）（ bpy）（H ₂ O）] ²⁺作为水氧化和苯羟基化反应的有效催化剂，在Sc（NO ₃）₃存在下水作为电子源。本研究报道了O ₂和H ₂对苯进行光催化羟基化的第一个实例O，这两种都是最绿色的试剂，在可见光照射下具有较高的周转率（例如，> 500）。机制研究表明，光催化还原的O ₂与H ₂ ö ₂是所述速率确定步骤，随后通过苯的有效的催化羟基化苯酚用H ₂ ö ₂，从而为基底的光催化氧化的新途径被O ₂和水。