An Exceptionally Stable Ti Superoxide Radical Ion: A Novel Heterogeneous Catalyst for the Direct Conversion of Aromatic Primary Amines to Nitro Compounds
作者:Gajanan K. Dewkar、Milind D. Nikalje、Iliyas Sayyed Ali、Abhimanyu S. Paraskar、H. S. Jagtap、A. Sudalai
A matrix-bound superoxide radical anion, generated by treating Ti(OR)4 (R=iPr, nBu) with H2 O2 , is a selective heterogeneous catalyst for the oxidation of anilines to the corresponding nitroarenes with 50 % aqueous H2 O2 [Eq. (1)]. Yields of 82-98 % are obtained, even with anilines bearing electron-withdrawing substituents (R=NO2 , COOH).
通过用H 2 O 2处理Ti(OR)4(R = iPr,nBu)生成的与基质结合的超氧自由基阴离子是一种选择性多相催化剂,用于用50%H 2 O水溶液将苯胺氧化为相应的硝基芳烃2 [式 (1)]。即使具有带吸电子取代基的苯胺(R = NO 2,COOH),也可得到82-98%的产率。
Oxygen as moderator in the zinc-mediated reduction of aromatic nitro to azoxy compounds
作者:Faiz Ahmed Khan、Ch. Sudheer
DOI:10.1016/j.tetlet.2009.02.122
日期:2009.7
A simple and useful protocol for the reduction of nitro arenes to their corresponding azoxy derivatives by employing zinc and NH4Cl in a mixture of [bmim][BF4] and water is described. The selectivereduction of nitro to azoxy is attributed to the hitherto unknown moderating effect of oxygen on zinc metal.
Controllable synthesis of azoxybenzenes and anilines with alcohol as the reducing agent promoted by KOH
作者:Rui Ping Wei、Feng Shi
DOI:10.1080/00397911.2019.1566472
日期:2019.3.4
Abstract Nitrobenzene and its derivatives can be selectively reduced to the corresponding azoxybenzene and aniline compounds with alcohols as the hydrogen source and KOH as the promoter only by simple changes of reaction conditions. Graphical Abstract
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.
sustainable Pd/SiO 2 nanospheres catalyst. Further, its catalytic activity was demonstrated for the direct reductive coupling of nitroarenes under mild conditions. While the reaction with Pdnanoparticles on other supporting materials such as modified carbon materials and TiO 2 , under similar conditions, resulted formation of amines exclusively. Therefore, it was confirmed that the SiO 2 was found to