Study on the influence of substituents upon the hydrogenation of nitrobenzene using a polymer-supported palladium-imidazole complex catalyst

Udayakumar, V.; Alexander, S.; Gayathri, V.; Shivakumaraiah,; Viswanathan, B.

doi:10.1007/s11144-011-0308-1

Cited by 9 publications

(4 citation statements)

References 34 publications

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“…Dimethylformamide and dimethyl sulphoxide, although polar, may coordinate strongly with the catalyst and so hinder coordination of hydrogen and/or olefin with the catalyst, resulting in low reaction rate. The higher solubility of hydrogen in methanol as compared to DMF and DMSO would also enhance the rate [30,31]. Hence, methanol was used as solvent for the hydrogenation of olefins and also for nitro compounds and Schiff bases ( Table 3).…”

Section: Kinetics Of the Hydrogenation Of Olefinsmentioning

confidence: 99%

Reduction of olefins, nitroarenes and Schiff base compounds by a polymer-supported [2-(2′-pyridyl)benzimidazole]palladium complex

Shilpa

Gayathri

2016

Transition Met Chem

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2-(2 0 -Pyridyl)benzimidazole (PBIMH) was functionalized onto chloromethylated polystyrene beads crosslinked with 6.5 % divinylbenzene, and this solid support was then reacted with Na 2 PdCl 4 in methanol. The functionalized beads were then activated using sodium borohydride. The resultant polymer-supported [2-(2 0 -pyridyl)benzimidazole]palladium complex (PSDVB-PBIM-PdCl 2 ) and its activated form were characterized by various physicochemical techniques. XPS studies confirmed the ?2 oxidation state of palladium in the supported complex. The activated complex was found to catalyse the hydrogenation of various organic substrates including olefins, nitro and Schiff base compounds. Kinetic measurements for the hydrogenation of cyclopentene, cyclohexene and cyclooctene were carried out by varying temperature, catalyst and substrate concentration. The energy and entropy of activation were evaluated from the kinetic data. The catalyst showed an excellent recycling efficiency over six cycles without leaching of metal from the polymer support, whereas the unsupported complex was unstable as metal leached out into the solution during the first run.

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Section: Kinetics Of the Hydrogenation Of Olefinsmentioning

confidence: 99%

Reduction of olefins, nitroarenes and Schiff base compounds by a polymer-supported [2-(2′-pyridyl)benzimidazole]palladium complex

Shilpa

Gayathri

2016

Transition Met Chem

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“…Linear correlation with a slope of 0.98 is clearly observed, which means that the activation process occurs on the surface of the catalyst and is sensitive to substituents. Former researches on various substituents effect in nitroaromatics to aminoaromatics reaction reported that both similar and opposite trends exist for different catalyst systems, which indicates that the effects from substituents are strongly determined by the catalyst system. , The result in Figure shows that electron-withdrawing groups accelerate the rate of reaction. One possible reason is that electron-withdrawing substituents reduce the electron density of the −NO 2 group, which makes the reactant easier to be trapped by electron-enriched 1T-MoS 2 under light irradiation.…”

Section: Resultsmentioning

confidence: 96%

“…To further investigate different activities and active sites between 1T/2H-MoS 2 and 2H-MoS 2 , a series of electrochemical measurements were carried out. According to previous researches, the total reaction route to this series of reactions is considered as shown in Scheme . ,,− …”

Section: Resultsmentioning

confidence: 99%

Hybrid Phase MoS₂ as a Noble Metal-Free Photocatalyst for Conversion of Nitroaromatics to Aminoaromatics

et al. 2021

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Molybdenum sulfide has attracted intense attention owing to unique heteromorphism. A natural molybdenum sulfide shows a semiconductive 2H crystal structure, while another metallic 1T-MoS2 exhibits a higher catalytic activity. However, the strict synthetic condition and the metastable property of 1T-MoS2 have limited its application. Hybrid-phase 1T/2H-MoS2 possesses both higher catalytic activity than 2H-MoS2 and better thermal/chemical stability than 1T-MoS2, which is a more promising candidate in the catalytic field. As for photocatalytic field, 2H-MoS2 has been only used as a cocatalyst but not as an individual photocatalyst due to its fast electron–hole recombination level and nonideal surface active site nature. Hybrid-phase MoS2 would provide a proper solution for individual MoS2 as a photocatalyst because 1T sites can collect photoelectrons and provide active sites for various reactions. In this work, we report a hybrid-phase MoS2 synthesized by a simple hydrothermal method, which is applied to the photocatalytic conversion of a series of nitroaromatics to aminoaromatics. The reactions are not favorable with natural 2H-MoS2, which reveals new potential of MoS2 as a noble metal-free photocatalyst.

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“…Moreover, the macromolecule compounds function as an inert carrier of metallic active centers, and their special macromolecule effect as well as the interactions with active particles and reaction mass further improves the reactivity of catalysts or selectivity of reaction [17][18][19]. Previous studies show that polyvinylpyrrolidone (PVP)-stabilized noble metals (e.g.…”

Section: Introductionmentioning

confidence: 99%

Polyvinylpyrrolidone-stabilized Pt colloidal catalysts in chloronitrobenzene hydrogenation and modification with rare earth ions

Cao

et al. 2015

Reac Kinet Mech Cat

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Polyvinylpyrrolidone (PVP)-stabilized Pt colloidal catalysts with hydrazine hydrate as a reductant were prepared in an H 2 PtCl 6 water solution/PVP/nbutanol microemulsion system. With m-chloronitrobenzene (m-CNB) selective hydrogenation as a probe, we studied how the microemulsion composition as well as the reduction conditions would affect the hydrogenation performance of PVP-Pt. The effects of rare earth ions on the modification of PVP-Pt were further studied. The as-prepared PVP-Pt improved the m-CNB hydrogenation activity and significantly enhanced the reactive selectivity compared with the ethanol reflux method. The addition of a small amount of Pr 3? -modified PVP-Pt/Pr (Pt:Pr molar ratio of 1:0.14) further improved the activity of the catalyst.

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Study on the influence of substituents upon the hydrogenation of nitrobenzene using a polymer-supported palladium-imidazole complex catalyst

Cited by 9 publications

References 34 publications

Reduction of olefins, nitroarenes and Schiff base compounds by a polymer-supported [2-(2′-pyridyl)benzimidazole]palladium complex

Reduction of olefins, nitroarenes and Schiff base compounds by a polymer-supported [2-(2′-pyridyl)benzimidazole]palladium complex

Hybrid Phase MoS₂ as a Noble Metal-Free Photocatalyst for Conversion of Nitroaromatics to Aminoaromatics

Polyvinylpyrrolidone-stabilized Pt colloidal catalysts in chloronitrobenzene hydrogenation and modification with rare earth ions

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Study on the influence of substituents upon the hydrogenation of nitrobenzene using a polymer-supported palladium-imidazole complex catalyst

Cited by 9 publications

References 34 publications

Reduction of olefins, nitroarenes and Schiff base compounds by a polymer-supported [2-(2′-pyridyl)benzimidazole]palladium complex

Reduction of olefins, nitroarenes and Schiff base compounds by a polymer-supported [2-(2′-pyridyl)benzimidazole]palladium complex

Hybrid Phase MoS2 as a Noble Metal-Free Photocatalyst for Conversion of Nitroaromatics to Aminoaromatics

Polyvinylpyrrolidone-stabilized Pt colloidal catalysts in chloronitrobenzene hydrogenation and modification with rare earth ions

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Hybrid Phase MoS₂ as a Noble Metal-Free Photocatalyst for Conversion of Nitroaromatics to Aminoaromatics