Lanthanum loaded CuO nanoparticles: synthesis and characterization of a recyclable catalyst for the synthesis of 1,4-disubstituted 1,2,3-triazoles and propargylamines

Abstract

The Lanthanum loaded CuO (LCO) nanoparticles (NPs) were successfully synthesized by precipitationthermal decomposition method and characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), energy dispersive spectra (EDS), diffuse reflectance spectra (DRS), photoluminescence (PL), X-ray photoelectron spectroscopy (XPS) and BET surface area measurements. 10 The synthesized LCO NPs was used as nanocatalyst for the synthesis of 1, 4-disubstituted-1, 2, 3-triazoles by click reaction of substituted benzyl azides and alkynes and synthesis of propargylamines via threecomponent coupling reaction of aldehydes, alkynes and amines under ultrasonication. One-pot operation, atom-economical nature, regioselectivity and good yields are the noteworthy features of this protocol. The reusability of the prepared nanocatalyst was successfully examined six times without any appreciable loss 15 in catalytic activity.

A Review on Recent Advances in the Application of Nanocatalysts in A3 Coupling Reactions

“…In 2015, Karthikeyan et al. successfully described a simple procedure for the synthesis of Lanthanum loaded CuO NPs (LCO NPs) through precipitation thermal decomposition method . The produced catalyst was used for the synthesis of propargylamines via three component coupling reaction of a wide range of aldehydes, alkynes and amines with high efficiency under ultrasonic irradiation (Scheme ).…”

“…It is important to stress that despite huge advancements of the reported works in the literature, another important challenges in the A 3 coupling reactions is nature of solvent and kind of the catalyst. A number of nanocatalysts, including copper, silver, gold, nickel, magnetic nanocatalysts and Co 3 O 4 , ZnS and nanopowder zinc titanate were successfully applied for A 3 coupling reactions with yields ranging from good to excellent in appropriate times in organic solvents or aqueous medium . The authors ascribed high catalytic activity of nanocatalysts to the particles size.…”

Synthesis and Antibacterial studies of Lanthanum, Cerium and Erbium loaded Copper Oxide Nanoparticles

“…Preparation, characterization and the catalytic activity of LCO NPs were reported earlier by our group [30] [31]. In the XRD spectrum of CCO system shown in figure 2b, at the 2θ values of 28.9θ which corresponds to the (111) plane [32] of Ce 4+ (JCPDS 898436) the presence of one new sharp peak is found in comparison with the bare CuO NPs.…”

Synthesis of 1,2,3‐Triazole Tethered 3‐Hydroxy‐2‐oxindoles: Promising Corrosion Inhibitors for Steel in Acidic Medium and Their Anti‐Microbial Evaluation

“…Further, the requirement of reducing agents and stabilizing ligands are considered potential disadvantages of this method. In this regard, the heterogeneous catalytic system is finding remarkable attention due to its merits such as catalyst recovery by simple filtration, reusability of catalyst, and additives are not required . Even though CuAAC reactions are proficiently performed in conventional solution phase, there is an increasing demand for non‐conventional approaches such as mechanochemistry (ball milling), microwave and ultrasound irradiation in terms of economical (feedstock) and environmental (energy consumption) response .…”