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Dive into the research topics where Arun K. Shil is active.

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Featured researches published by Arun K. Shil.


Green Chemistry | 2013

Solid supported platinum(0) nanoparticles catalyzed chemo-selective reduction of nitroarenes to N-arylhydroxylamines

Arun K. Shil; Pralay Das

Solid supported platinum(0) (SS-Pt) nanoparticles were developed as a heterogeneous catalyst following a reduction/deposition method and characterized by SEM, TEM, EDX and XRD analysis. The SS-Pt catalyst was applied in the chemo-selective reduction of nitroarenes to N-arylhydroxylamines using hydrazine hydrate as a hydrogen source. A wide variety of reducible functional groups such as halides, carboxylic acids, esters, amides, nitriles, keto, alkenes, alkynes and N-benzyl were well tolerated under the reaction conditions. This process was further successfully employed in 10 g scale reactions. N-Arylhydroxylamines were further applied for catalyst free synthesis of azoxybenzenes. Moreover, use of PEG-400 as cheap reaction medium, additive free methodology and the recyclability of SS-Pt catalyst up to ten times without significant loss of catalytic activity evidently follow the principles of green chemistry.


Organic Letters | 2015

Supported Palladium Nanoparticle-Catalyzed Carboxylation of Aryl Halides, Alkenylsilanes, and Organoboronic Acids Employing Oxalic Acid as the C1 Source

Arun K. Shil; Sandeep Kumar; C. Bal Reddy; Sumit Dadhwal; Vandna Thakur; Pralay Das

Polystyrene-supported palladium(0) (Pd@PS) nanoparticles as a heterogeneous catalyst have been developed for caboxylation of aryl halides, alkenylsilanes, and organoboronic acids to produce the corresponding carboxylic acids with minor quantities of corresponding aldehydes using bench-stable and inexpensive oxalic acid as the C1 source under focused microwave irradiation. The close vicinity of oxalic acid to Pd@PS maintained through ionic bonding helped to produce CO2 over the catalytic surface that concurrently participated in the carboxylation reaction.


RSC Advances | 2013

A solid supported palladium(0) nano/microparticle catalyzed ultrasound induced continuous flow technique for large scale Suzuki reactions

Arun K. Shil; Nitul Ranjan Guha; Dharminder Sharma; Pralay Das

An ultrasound-induced continuous flow technique was developed for the solid supported palladium(0) nano/microparticle (SS-Pd) catalyzed Suzuki cross coupling reaction of haloarenes (chloro, bromo and iodo) with phenyl boronic acid on a gram scale. An externally conjugated reservoir was fitted for easy operation of the reaction in water under mild basic conditions. The SS-Pd catalyst was found to be very stable in aqueous media, easily separable and recyclable up to five runs without significant loss of activity. Furthermore, the scaling of the well known Suzuki reaction up to 5 g scale under mild ultrasonic irradiation can be of industrial interest in the future.


Molecular Diversity | 2013

Cyclohexyl iodide promoted approach for coumarin analog synthesis using small scaffold.

Dharminder Sharma; C. B. Reddy; Arun K. Shil; Rashi Prakash Saroach; Pralay Das

AbstractNew chemical approaches were adopted for the synthesis of biologically important coumarins utilizing cyclohexane-1,3-dione derivatives as novel scaffold which were prepared from acetone and ethyl acrylate following our previous report. The stepwise strategies of aromatization, dehydrogenation, and demethylative cyclization were followed for coumarins synthesis from cyclohexane-1,3-dione derivatives. This work reports the first time cyclohexyl iodide was used for the demethylative cyclization reaction of


RSC Advances | 2013

Microwave assisted solvent and catalyst free method for novel classes of β-enaminoester and acridinedione synthesis

Dharminder Sharma; Bandna; C. Bal Reddy; Sandeep Kumar; Arun K. Shil; Nitul Ranjan Guha; Pralay Das


Catalysis Letters | 2014

Solid Supported Palladium(0) Nanoparticles: An Efficient Heterogeneous Catalyst for Regioselective Hydrosilylation of Alkynes and Suzuki Coupling of β-Arylvinyl Iodides

C. Bal Reddy; Arun K. Shil; Nitul Ranjan Guha; Dharminder Sharma; Pralay Das

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RSC Advances | 2015

Polystyrene resin supported palladium(0) (Pd@PR) nanocomposite catalyzed synthesis of β-aryl and β,β-diaryl unsaturated scaffolds following tandem approaches

Arun K. Shil; Pralay Das


RSC Advances | 2015

Polystyrene resin supported palladium(0) (Pd@PR) nanocomposite mediated regioselective synthesis of 4-aryl-1-alkyl/(2-haloalkyl)-1H-1,2,3-triazoles and their N-vinyl triazole derivatives from terminal alkynes

Arun K. Shil; Sandeep Kumar; Saurabh Sharma; Abha Chaudhary; Pralay Das

β,β-diaryl acrylates for 4-arylcoumarins synthesis. Graphical abstract


Tetrahedron Letters | 2012

Solid supported Pd(0): an efficient recyclable heterogeneous catalyst for chemoselective reduction of nitroarenes ☆

Arun K. Shil; Dharminder Sharma; Nitul Ranjan Guha; Pralay Das

Novel classes of β-enaminoesters were synthesized using our newly described ethyl-3-(2,4-dioxocyclohexyl)propanoate molecule (1) under solvent and catalyst free microwave assisted conditions. No work-up procedure, milder reaction conditions, wide substrate scope and high yields add extra importance to this method and open up the scope for acridinediones as well as peptidomimetic molecule synthesis.


Tetrahedron Letters | 2011

Solid-supported palladium nano and microparticles: an efficient heterogeneous catalyst for ligand-free Suzuki–Miyaura cross coupling reaction☆

Pralay Das; Dharminder Sharma; Arun K. Shil; Avnesh Kumari

The solid supported palladium(0) nanoparticles (NPs) were found as an active heterogeneous catalyst for regioselective hydrosilylation of alkynes with organosilanes in the presence of NaI as additive. Aliphatic as well as aromatic terminal/substituted alkynes with both electron releasing and withdrawing functionalities similarly participated in the hydrosilylation to produce regioselective β-isomers of vinylsilanes under mild reaction conditions. Reducible functional groups such as nitrile, ester, halide, alkene and alkyne were also found to be tolerated under this condition. Furthermore, the triethylsilylstyrene was applied for consecutive iododesilylation followed by Suzuki coupling reaction to produce stilbenes. The air/moisture stable SS–Pd catalyst was recycled for hydrosilylation reaction up to ten runs without significant loss of its catalytic activity.Graphical AbstractSolid Supported Palladium(0) Nanoparticles: An Efficient Heterogeneous Catalyst for Regioselective Hydrosilylation of Alkynes and Suzuki Coupling of β-Arylvinyl Iodides

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Pralay Das

Council of Scientific and Industrial Research

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Dharminder Sharma

Council of Scientific and Industrial Research

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Nitul Ranjan Guha

Council of Scientific and Industrial Research

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Bandna

Council of Scientific and Industrial Research

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Sandeep Kumar

Raman Research Institute

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C. Bal Reddy

Council of Scientific and Industrial Research

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Vandna Thakur

Council of Scientific and Industrial Research

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Abha Chaudhary

Council of Scientific and Industrial Research

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Ajay Kumar

Council of Scientific and Industrial Research

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Avnesh Kumari

Council of Scientific and Industrial Research

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