催化作用
化学
纳米棒
偶氮
氧化还原
转移加氢
硝基
基础(拓扑)
氧气
乙醇
无机化学
光化学
有机化学
材料科学
钌
纳米技术
数学分析
烷基
数学
作者
Ziliang Yuan,Liang Huang,Yuanshuai Liu,Yong Sun,Guanghui Wang,Xun Li,Johannes A. Lercher,Zehui Zhang
标识
DOI:10.1002/anie.202317339
摘要
CeO2 nanorod based catalysts for the base-free synthesis of azoxy-aromatics via transfer hydrogenation of nitroarenes with ethanol as hydrogen donor have been synthesized and investigated. The oxygen vacancies (Ov ) and base sites are critical for their excellent catalytic properties. The Ov , i.e., undercoordinated Ce cations, serve as the sites to activate ethanol and nitroarenes by lowering the energy barrier to transfer hydrogen from α-Csp3 -H in ethanol to the nitro group coupling it to the redox reactions between Ce3+ and Ce4+ . At the same time, the base sites catalyze the condensation step to selectively produce azoxy-aromatics. The catalytic route opens a much improved way to use non-noble metal oxides without additives for the selective functional group reduction and coupling reactions.
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