Ultrasound-accelerated selective oxidation of primary aromatic amines to azoxy derivatives with trans-3,5-dihydroperoxy-3,5-dimethyl-1,2-dioxolane catalyzed by Preyssler acid-mediated nano-TiO2
Stabilisation of gold nanoparticles by N-heterocyclic thiones
作者:Leonardo C. Moraes、Bertrand Lacroix、Rute C. Figueiredo、Patricia Lara、Javier Rojo、Salvador Conejero
DOI:10.1039/c7dt01856h
日期:——
Gold nanoparticles (Au-NPs) have been prepared using N-heterocyclic thiones (NHTs) as ligand stabilisers. These Au-NPs have been shown to be very stable, even in air, and have been characterized by a combination of several techniques (TEM, HR-TEM, STEM-HAADF, EDX, DLS, elemental analysis and 1H NMR). These nanoparticles are active in the catalytic reduction of nitroarenes to anilines.
金纳米颗粒(Au-NPs)已使用N-杂环硫酮(NHTs)作为配体稳定剂制备。这些Au-NP甚至在空气中也显示出非常稳定的特性,并且已通过多种技术(TEM,HR-TEM,STEM-HAADF,EDX,DLS,元素分析和1 H NMR)的组合进行了表征。这些纳米颗粒在将硝基芳烃催化还原成苯胺中具有活性。
Synthesis of Azoxybenzenes by Reductive Dimerization of Nitrosobenzene
Herein we report an effective and simple preparation method of substituted azoxybenzenes by reductive dimerization of nitrosobenzenes. This procedure requires no additional catalyst/reagent and can be applied to substrates with a wide range of substitution patterns.
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