Heteropolyacid coupled with cyanoguanidine decorated magnetic chitosan as an efficient catalyst for the synthesis of pyranochromene derivatives

Abstract

In this study, a novel nanocatalyst was successfully prepared by heteropolyacid immobilization of magnetic chitosan-cyanoguanidine composite and fully characterized by different analysis methods, including FTIR, XRD, TGA, SEM, and EDS. The catalytic activity of fabricated composite was examined in a one-pot three-component reaction, involving the diverse active methylene compounds, various aryl aldehydes, and malononitrile in water. The results revealed the efficient catalytic performance of composite, while all reactions proceeded smoothly and led to the formation of the corresponding pyranochromene derivatives in high to excellent yields.

Design of [BmIm]3PW12O40 Ionic Liquid Encapsulated-ZIF-8 Nanocomposite for Cationic Dye Adsorptive Removal: Modeling by Response Surface Methodology

“…3. To analyze experimental data, the second-order polynomial model in CCD methodology was applied, as follows: (7) where Y is the predicted MB removal, β 0 is the intercept, β i are the linear coefficients, β ii are quadratic coefficients, β ij are the interaction coefficients, and x i and x j are the coded values of independent factors. 37 3.2.4.…”

“…6 Over the last two decades, POM chemistry has developed tremendously, and have found application as green inorganic clusters in catalysis, photonics, electronics, magnetics, and medicine. 7 They have grown due to their unique tunable characteristics, such as high Brønsted acidity, reversible redox properties, high thermal and chemical stability, nontoxicity, ease of handling, and environmental compatibility. 8 The anion part of POMs can react with various IL cations via electrostatic interaction to form similar new organic−inorganic hybrid molecular materials.…”