Search

In all cases, the three-component reaction produced excellent yields (mean yield 96%). The reaction yield increased with an increase in catalyst amount from 2 mol% to 10 mol%, but catalyst loading beyond 10 mol % showed no improvement in the reaction yield. CeO SB 2 sb nanoparticles (NPs) have received a great deal of attention in recent years due to their numerous applications in a variety of fields such as catalysis,[1] ceramics,[2] fuel cells,[3] gas sensors,[4],[5] solid-state electrolytes,[6] ceramic biomaterials,[7] chemical-mechanical polishing (CMP),[8] and ultraviolet absorbtion.[9] The CeO SB 2 sb nanomaterial is an excellent catalyst due to its oxygen storage and release capacity (OSC) via the redox shift between Ce SP 4+ sp and Ce SP 3+ sp under oxidizing and reducing conditions.[10],[11] Different morphologies of CeO SB 2 sb nanomaterials for catalytic activity have been investigated.[1],[11] Numerous nanostructures of CeO SB 2 sb have been prepared and used as catalysts, including nanoparticles, nanotubes, nanowires, nanorods, nanocubes, and nanospindles. To evaluate the effect of temperature on the reaction yield, the model reaction was conducted at different temperatures with an optimized catalyst loading. [Extracted from the article]

CoCeO2 NPs were successfully synthesized and confirmed using x‐ray diffraction (XRD), field emission scanning electron microscopy (FESEM), and high‐resolution transmission electron microscopy (HRTEM) techniques. The catalytic performance of the synthesized CoCeO2 NPs catalyst was examined during the one‐pot multicomponent synthesis of biologically significant 2‐amino‐3‐cyano‐4H‐pyran derivatives. The reaction was easily accomplished using a one‐pot, three‐component reaction of dimedone, aryl aldehydes, and malononitrile in ethanol under reflux, with excellent yields and a short reaction time. The current catalytic system is more appealing because of its simple reaction conditions, uncomplicated product isolation, economic feasibility, and reusability of the catalyst free from significant loss of activity. This process offers an effective strategy for the synthesis of 2‐amino‐3‐cyano‐4H‐pyran derivatives. [ABSTRACT FROM AUTHOR]