Search

An innovative and environmentally sustainable approach is presented for the synthesis of cadmium oxide nanoparticles (CdONPs), leveraging the leaf extract of the pigeon pea plant (Cajanus cajan) as both reductive and capping agents. This environmentally friendly heterogeneous CdONPs was meticulously characterized through FT‐IR, PXRD, HR‐TEM, SEM‐EDAX, XPS and UV‐Vis spectroscopic analyses. These NPs were subsequently applied to facilitate the three‐component Biginelli reaction using ethyl acetoacetate, urea, and substituted benzaldehydes for producing dihydropyrimidone derivatives in good to excellent yield. The methodology was tested for different aldehydes containing electron‐withdrawing and electron‐donating groups. The catalyst demonstrated consistent performance over approximately five cycles, exhibiting negligible loss in yield and catalytic potential. The proposed mechanistic pathway of the reaction was elucidated through intermediate mass analysis and further validated by Density Functional Theory (DFT) calculations and catalytic surface adsorption studies. [ABSTRACT FROM AUTHOR]

Green synthesis of silver nanoparticles (AgNPs) was carried out using aqueous bark extract of Shorea robusta(Sal tree) as the reducing and capping agent. AgNPs were characterized using modern characterization tools like UV-Vis, PXRD, FT-IR, SEM, and HR-TEM. The catalytic application of the prepared AgNPs in three-component coupling reaction of aldehyde, malononitrile, and cyclic enamino ketone resulted in good to excellent yields of hexahydroquinoline derivatives. Moreover, the catalyst can be recycled up to 5 times without compromising too much yield. The mechanistic pathway was investigated employing GC-Mass spectroscopy and supported through the Density Functional Theory (DFT) calculations. A two-step mechanism has been proposed for the coupling reaction, and the presence of electron-withdrawing group in the aldehyde component is found to be more favorable than electron-releasing one in terms of yield with lesser time. [ABSTRACT FROM AUTHOR]

The silver catalysis towards the hydration of terminal alkynes is explored using Silver(I) triflate (AgOTf). The reaction leads to the formation of only Markovnikov addition product with excellent yield. Copyright © 2012 John Wiley & Sons, Ltd. [ABSTRACT FROM AUTHOR]

This is the first report of gold-free silver catalysis for hydration of terminal alkynes to the Markovnikov addition product. [ABSTRACT FROM AUTHOR]

The utility of Ag(I) salts in the different processes is demonstrated. [ABSTRACT FROM AUTHOR]

AgOTf proves to be an effective Lewis acid catalyst for the transesterification of β-ketoesters with a variety of aromatic, aliphatic and allylic alcohols in boiling toluene. [ABSTRACT FROM AUTHOR]