Direct Hydrogenation of Nitroaromatics and One‐Pot Amidation with Carboxylic Acids over Platinum Nanowires

Li, Min; Hu, Lei; Cao, Xueqin; Hong, Haiyan; Lu, Jianmei; Gu, Hongwei

doi:10.1002/chem.201002801

Cited by 70 publications

(33 citation statements)

References 40 publications

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“…Arrays of free-standing nanowires are of particular interest both for fundamental science and potential applications in many fields, such as catalysis, [1,2] sensing, [3][4][5] Li-ion batteries [6][7][8] and solar cells. [9,10] In the field of batteries, for example, there are extensive efforts to employ free-standing nanowire arrays as electrodes to improve the performance of future generations of Li-ion batteries.…”

Section: Introductionmentioning

confidence: 99%

Free‐Standing Aluminium Nanowire Architectures Made in an Ionic Liquid

Abedin

Endres

2011

ChemPhysChem

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We report on the electrochemical synthesis of free-standing aluminium nanowire architectures through a template-assisted electrodeposition technique. For this purpose, nuclear track-etched polycarbonate membranes were employed as templates. One side of the template was sputtered with a thin gold film to serve as a working electrode. Subsequently the nanowires were made in the ionic liquid 1-ethyl-3-methylimidazolium chloride ([EMIm]Cl)/AlCl(3) (40/60 mol %) under potentiostatic conditions. Two different electrodeposition procedures were employed to fabricate strongly adherent Al nanowire structures on an electrodeposited Al layer. In the first procedure, electrodeposition simultaneously occurs along the pores of the template and on the Au-sputtered side of the template. In the second procedure, electrodeposition takes place in two different steps: first a thick supporting film of Al is deposited on the sputtered side of the membrane and second Al nanowires are grown within the pores. After chemical dissolution of the membrane in dichloromethane, an aluminium foil of a controlled thickness with a three-dimensional nanowire structure on one side was obtained. Different nanowire architectures, such as free-standing nanowires, vertically aligned tree-shaped arrays, and bunched nanowire films, were obtained. Such nanowire architectures are of particular interest for applications in Li-ion micro-batteries.

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Section: Introductionmentioning

confidence: 99%

Free‐Standing Aluminium Nanowire Architectures Made in an Ionic Liquid

Abedin

Endres

2011

ChemPhysChem

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“…Finally, in a comparison between the efficiency of Ag/AgX/rGO photocatalysts with the previously reported approaches that had been developed for the synthesis of paracetamol (APAP) (Scheme ). The first route was the hydrogenation of p‐nitrophenol (PNP) to the corresponding APAP in presence of acetic acid under hydrogen atmosphere as reducing agent under at 100 °C for 24 hr (Scheme , route 1) . Another approach in which APAP was prepared by the reaction of 4‐hydroxyacetophenone with a hydroxylamine salt to obtain 4‐hydroxyacetophenone oxime, followed by a Beckmann rearrangement in the presence of a catalyst e.g.…”

Section: Resultsmentioning

confidence: 99%

Silicon‐grafted Ag/AgX/rGO nanomaterials (X = Cl or Br) as dip‐photocatalysts for highly efficient p‐nitrophenol reduction and paracetamol production

Attia

Mohamed

2018

Applied Organom Chemis

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In this work, plasmonic Ag/AgX/rGO (X = Cl or Br) nano‐photocatalysts were grafted with silicon by adding trimethylsilyl chloride as silicon precursor. The synthesized Ag/AgX/rGO‐Si hybrids showed a large improvement of photocatalytic activity towards the synthesis of p‐aminophenol (PAP) as well as paracetamol (acetaminophen; APAP) through the photoreduction of p‐nitrophenol (PNP). The prepared catalysts Ag/AgX/rGO were characterized using SEM, XRD, FTIR and the reduction reaction of p‐nitrophenol was monitored by UV–Vis measurements, GC/MS and 1HNMR data. From the results, it was demonstrated that the rate order of reduction process of the PNP to PAP and to APAP under visible light irradiation of the samples was as follows; Ag/AgBr/rGO‐Si > Ag/AgCl/rGO‐Si > Ag/AgBr/rGO > Ag/AgCl/rGO. The reaction mechanism had been postulated that was supported with the spectroscopic data. In addition, the catalysts were recovered from the reaction medium and re‐used in three cycles that indicated the reusability and stability of the catalysts. This study was featured by the following; i) fast reaction, ii) the reduction of p‐nitrophenol to paracetamol was performed in a facile one‐pot reaction compared to previous approaches that tends to reduce the production cost, and iii) investigations on the catalytic properties of Ag/AgX/rGO in organic transformations open the door to find a benefice of these catalysts in other organic reactions and in the development in the synthesis of pharmaceutical products.

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“…45 Pt nanowires were prepared by a reported procedure by Sun and coworkers consisting of the acidic etching of the FePt nanowire in methanol. 45 Pt nanowires were prepared by a reported procedure by Sun and coworkers consisting of the acidic etching of the FePt nanowire in methanol.…”

Section: Other Ptnps Systemsmentioning

confidence: 99%

The hydrogenation of nitroarenes mediated by platinum nanoparticles: an overview

Lara

Philippot

2014

Catal. Sci. Technol.

159

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Hydrogenation of nitroarenes is a catalytic reaction of high interest owing to the importance of the resulting anilines for the chemical industry. For this transformation, a huge number of catalysts based on different metals have been reported so far. However, the chemoselective reduction of the nitro group when other reducible functionalities are present in the nitroaromatic substrates remains a challenging goal, and significant effort has been devoted to the development of more selective catalysts. In this context, metal nanoparticles (MNPs) have emerged as a good alternative to molecular complexes, and much attention is currently paid to their synthesis in order to achieve efficient and selective nanocatalysts. Non-supported and supported nanoparticles have been used for this catalytic reaction, and among them, platinum nanoparticles (PtNPs) appear as promising catalysts, due to the fact that they combine a good activity in nitro reduction while keeping a certain degree of selectivity. Herein, the most recent advances related to the preparation and application of PtNPs as catalysts in the hydrogenation of nitroaromatics are reviewed.Catal. Sci. Technol. This journal is

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Direct Hydrogenation of Nitroaromatics and One‐Pot Amidation with Carboxylic Acids over Platinum Nanowires

Cited by 70 publications

References 40 publications

Free‐Standing Aluminium Nanowire Architectures Made in an Ionic Liquid

Free‐Standing Aluminium Nanowire Architectures Made in an Ionic Liquid

Silicon‐grafted Ag/AgX/rGO nanomaterials (X = Cl or Br) as dip‐photocatalysts for highly efficient p‐nitrophenol reduction and paracetamol production

The hydrogenation of nitroarenes mediated by platinum nanoparticles: an overview

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