Arun K. Shil
Council of Scientific and Industrial Research
Network
Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by Arun K. Shil.
Green Chemistry | 2013
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
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
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
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
Dharminder Sharma; Bandna; C. Bal Reddy; Sandeep Kumar; Arun K. Shil; Nitul Ranjan Guha; Pralay Das
Catalysis Letters | 2014
C. Bal Reddy; Arun K. Shil; Nitul Ranjan Guha; Dharminder Sharma; Pralay Das
\upbeta , \upbeta
RSC Advances | 2015
Arun K. Shil; Pralay Das
RSC Advances | 2015
Arun K. Shil; Sandeep Kumar; Saurabh Sharma; Abha Chaudhary; Pralay Das
β,β-diaryl acrylates for 4-arylcoumarins synthesis. Graphical abstract
Tetrahedron Letters | 2012
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
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