- Cellulose-reinforced poly(ethylene-co-vinyl acetate)-supported Ag nanoparticles with excellent catalytic properties: Synthesis of thioamides using the Willgerodt-Kindler reaction
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Cellulose, a bio-derived polymer, is widely used in food packaging, dye removal, coatings, and solidsupported catalysis. Heterogeneous catalysts play a critical role in environmental remediation. In this context, the demand for green and cost-effective catalysts has rapidly increased. In this study, cellulose was extracted from rice straw, and a highly active solid-supported catalytic model was developed. First, cellulose was conjugated with poly(ethylene-co-vinyl acetate) (PEVA), and then Ag nanoparticles (AgNPs) were inserted into the cellulose-PEVA composite. The process involved the reduction of AgNPs in the presence of sodium borohydride. The fabricated hybrid catalyst was characterized using Fouriertransform infrared spectroscopy, scanning electron microscopy, energy dispersive X-ray, and powder Xray diffraction. Thereafter, the obtained hybrid was used as a catalyst for the Willgerodt-Kindler reaction of aromatic aldehydes, amines, and S8 to synthesize thioamides with excellent yields. The developed catalytic system exhibited high stability and recyclability. Moreover, the mechanical properties of the hybrid catalyst were evaluated using tensile strength and impact tests. RGB analysis of digital images was also performed to investigate the primary components of the catalyst.
- Jang, Doo Ok,Kaur, Navneet,Saini, Sanjeev,Singh, Anoop,Singh, Narinder
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p. 6659 - 6667
(2022/03/31)
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- A new application of rhodanine as a green sulfur transferring agent for a clean functional group interconversion of amide to thioamide using reusable MCM-41 mesoporous silica
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A novel thionation protocol for amide compounds, with the system rhodanine/secondary amine has been discovered. Clean and efficient synthesis of a variety of thioamides can be achieved through this simple and convenient method using MCM-41 mesoporous silica as an acid catalyst. For this purpose we have synthesized MCM-41 silica and characterized by using an array of sophisticated analytical techniques like BET, HR TEM, EDX, XRD, 29Si MAS NMR and FTIR. This reaction is therefore a very neat example of a functional group interconversion.
- Ray, Suman,Bhaumik, Asim,Dutta, Arghya,Butcher, Ray J.,Mukhopadhyay, Chhanda
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p. 2164 - 2170
(2013/05/08)
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