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.
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.
Mild and selective catalytic oxidation of organic substrates by a carbon nanotube-rhodium nanohybrid
作者:Simon Donck、Edmond Gravel、Alex Li、Praveen Prakash、Nimesh Shah、Jocelyne Leroy、Haiyan Li、Irishi N. N. Namboothiri、Eric Doris
DOI:10.1039/c5cy00985e
日期:——
A heterogeneous catalyst was assembled by stabilization of rhodium nanoparticles on carbon nanotubes. The nanohybrid was used for the catalytic aerobic oxidation of diverse substrates such as hydroquinones, hydroxylamines, silanes, hydrazines and thiols, at room temperature. The system proved very efficient on the investigated substrates and demonstrated high selectivity.
Continuous Flow Synthesis of Azoxybenzenes by Reductive Dimerization of Nitrosobenzenes with Gel‐Bound Catalysts
作者:Carsten J. Schmiegel、Patrik Berg、Franziska Obst、Roland Schoch、Dietmar Appelhans、Dirk Kuckling
DOI:10.1002/ejoc.202100006
日期:2021.3.19
In search for a new synthetic pathway for azoxybenzenes with different substitution patterns, an approach using a microfluidic reactor with gel‐bound proline organocatalysts under continuous flow inside a microfluidic device is presented.