Heteroployacid on the composite of boehmite and polyionic liquid as a catalyst for alcohol oxidation and tandem alcohol oxidation Knoevenagel condensation reactions

Abstract

Using boehmite as an available and low-cost natural compound, a bi-functional catalytic composite is prepared through vinyl-functionalization of boehmite, followed by polymerization with the as-prepared bis-vinylimidazolium bromide ionic liquid and supporting of phosphotungstic acid. The catalyst was characterized via ICP, XRD, TGA, FTIR, SEM/EDS and elemental mapping analysis and applied for promoting alcohol oxidation reaction and one-pot tandem alcohol oxidation/Knoevenagel condensation reaction in aqueous media under mild reaction condition. The results indicated high catalytic activity of the catalyst for both reactions. This protocol showed high generality and aliphatic, aromatic and heterocyclic alcohols could be applied as substrates to furnish the corresponding products in high to excellent yields. Furthermore, hot filtration test confirmed true heterogeneous nature of the catalysis. The catalyst could also be recovered readily and reused for at least five runs of the reaction with low loss of the activity and phosphotungstic acid leaching upon each run.

3D-Printed Cyclodextrin Polymer Encapsulated Wells–Dawson: A Novel Catalyst for Knoevenagel Condensation Reactions

“…To stabilize WD on CDNS, we employed the conventional wet impregnation method, as outlined in our previous work . Specifically, we dissolved WD (20 wt %) in 5 mL of deionized water and gradually introduced it into a stirring suspension containing 1 g of CDNS in deionized water.…”

“…Two technologies are used in this approach: (i) indirect, whereby a template is created, printed from a polymer resin, filled with the appropriate mixture, and finally burned out, or (ii) direct, wherein the polymer resin is mixed with other components, such as alumina, silica, hydroxyapatite, or zirconium. 29 Building upon our ongoing exploration of heterogeneous catalysts 30,31 and POMs, 32 we present a novel approach that combines 3D printing technology with CDNS chemistry to address the challenge of leaching associated with WD-type POMs, while concurrently developing a proficient heterogeneous catalyst. In this context, we detail a comprehensive methodology involving the immobilization of WD onto CDNS, followed by the 3D printing process to produce a resilient catalyst denoted as 3D-WD@CDNS.…”

“…Building upon our ongoing exploration of heterogeneous catalysts , and POMs, we present a novel approach that combines 3D printing technology with CDNS chemistry to address the challenge of leaching associated with WD-type POMs, while concurrently developing a proficient heterogeneous catalyst. In this context, we detail a comprehensive methodology involving the immobilization of WD onto CDNS, followed by the 3D printing process to produce a resilient catalyst denoted as 3D-WD@CDNS.…”

Poly(ionic liquid)s: an emerging platform for green chemistry

“…27b, the B-V-PIL/W catalyst showed only a slight activity loss after five runs of both reactions. 136 Chen et al synthesized a poly(ionic liquid)-supported vanadate catalyst (V-PIL) via reacting poly(vinylimidazole) (PVIM) with peroxy-vanadic acid (Fig. 28a).…”

“…27b, the B-V-PIL/W catalyst showed only a slight activity loss after five runs of both reactions. 136…”