卤化物
铋
光催化
光化学
材料科学
多孔性
苯酚
金属
甲烷氧化偶联
钙钛矿(结构)
联轴节(管道)
氧化磷酸化
无机化学
化学
有机化学
催化作用
冶金
复合材料
生物化学
作者
Jinsun Lee,Ashwani Kumar,Harun Tüysüz
标识
DOI:10.1002/anie.202404496
摘要
The selective oxidative coupling of phenol derivatives, involving carbon‐carbon (C‐C) and carbon‐oxygen (C‐O) bond formation, has emerged as a critical approach in the synthesis of natural products. However, achieving precise control over the selectivity in coupling reactions of unsubstituted phenols utilizing solar light as the driving force remains a big challenge. In this study, we report a series of porous Cs3Bi2X9 (X = Cl, Br, I) photocatalysts with tailored bandgaps and compositions engineered for efficient solar‐light‐driven oxidative phenol coupling. Notably, p‐Cs3Bi2Br9 exhibited about 73 % selectivity for C‐C coupling, displaying a high formation rate of 47.3 μmol gcat.−1 h‑1 under solar radiation. Furthermore, this approach enables control of the site‐selectivity for phenol derivatives on Cs3Bi2X9, enhancing C‐C coupling. The distinctive porous structure and appropriate band‐edge positions of Cs3Bi2Br9 facilitated efficient charge separation, and surface interaction/activation of phenolic hydroxyl groups, resulting in the kinetically preferred formation of C‐C over C‐O bond. Mechanistic insights into the reaction pathway, supported by comprehensive control experiments, unveiled the crucial role of interfacial charge transfers and Lewis acid Bi sites in stabilizing phenolic intermediates, thereby directing the regioselectivity of diradical couplings and resulting in the formation of unsymmetrical biphenols.
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