Controlling the type of indium salt and hydrosilane enables a highly selective reduction of aromatic nitro compounds into three coupling compounds, azoxybenzenes, azobenzenes and diphenylhydrazines, and one reductive compound, anilines.
Facile Transfer Hydrogenation of Azo Compounds to Hydrazo Compounds and Anilines by Using Raney Nickel and Hydrazinium Monoformate
作者:H. S. Prasad、Shankare Gowda、D. Channe Gowda
DOI:10.1081/scc-120027231
日期:2004.12.31
Abstract Azo compounds are conveniently reduced to either partially reduced hydrazo compounds or completely reduced anilines by employing Raney nickel in presence of hydrazinium monoformate depending upon reaction conditions. The other reducible moieties like ‒COOH and halogens are tolerated. The reduction process is selective, rapid and high yielding.
Tandem selective reduction of nitroarenes catalyzed by palladium nanoclusters
作者:Ziqiang Yan、Xiaoyu Xie、Qun Song、Fulei Ma、Xinyu Sui、Ziyu Huo、Mingming Ma
DOI:10.1039/c9gc03957k
日期:——
borohydride (NaBH4) in aqueous solution under ambient conditions, which can selectively produce five categories of nitrogen-containing compounds: anilines, N-aryl hydroxylamines, azoxy-, azo- and hydrazo-compounds. The catalyst is in situ-generated ultrasmall palladium nanoclusters (Pd NCs, diameter of 1.3 ± 0.3 nm) from the reduction of Pd(OAc)2 by NaBH4. These highlyactivePd NCs are stabilized by
Mg/Triethylammonium Formate: A Useful System for Reductive Dimerization of Araldehydes into Pinacols; Nitroarenes into Azoarenes and Azoarenes into Hydrazoarenes
作者:M. GEETA PAMAR、P. GOVENDER、K. MUTHUSAMY、RUI W. M. KRAUSE、H.M. NANJUNDASWAMY
DOI:10.13005/ojc/290316
日期:2013.9.30
of triethylammoniumformate in the presence of magnesium for the efficient intermolecular pinacol coupling using MeOH as solvent. Various aromatic carbonyls underwent smooth reductive coupling to give the corresponding 1,2-diols. A series of azo compounds were obtained by the reductive coupling of nitroaromatics while azo compounds were reduced to the corresponding hydrazoarenes by this system. There
the electronic structure of the Ni-WC/C catalyst, and endowing the catalyst with switchable selectivity and high activity for the reduction of nitroarenes by hydrogenation. This synergistic multi-interfacial catalyst may offer a new way to design and explore highly efficient and selective catalysts for the controllable reduction of nitroarenes and similar hydrogenation reactions.
选择性还原硝基芳烃在工业化学生产中非常有价值。主要的还原产物通常是使用单组分贵金属或过渡金属催化剂获得的苯胺衍生物。但是,其他重要的产物,例如苯衍生物,总是要在苛刻的条件下和多个反应步骤中进行。在此,仅通过控制硝基芳烃与N 2 H 4 ·H 2的摩尔比,就可以实现高产率和高选择性地将硝基芳烃意外地还原为苯胺或苯衍生物。O,负载在碳上的镍-碳化钨复合纳米催化剂(Ni-WC / C)。一系列控制实验和密度泛函理论(DFT)计算表明,Ni和WC之间的多个界面可产生协同效应,显着调节Ni-WC / C催化剂的电子结构,并使催化剂具有可切换的选择性和选择性。氢化还原硝基芳烃的高活性。这种协同的多界面催化剂可能为设计和探索高效和选择性的催化剂提供新途径,以控制硝基芳烃的还原反应和类似的氢化反应。