Three Si-substituted polyoxovanadates as efficient catalysts for Knoevenagel condensation and selective oxidation of styrene to benzaldehyde

Abstract

Three new Si-substituted polyoxovanadates (POVs), [Cd2(dien)2][Cd(dien)][Cd(Hdien)2][V15Si6O46(OH)2(H2O)]•7H2O (1), [Co(enMe)2]3[Co(enMe)(H2O)]2[V16Si4O44(OH)2(H2O)]•6H2O (2), [Co(teta)]4[V16Si4O42(OH)4(H2O)]•10H2O (3) (dien = diethylenetriamine; enMe = 1,2-diaminopropane; teta = triethylenetetramine) were synthesized by hydrothermal method and characterized. Structural analysis shed...

Investigation of the substituent effects on the oxidation of styrene derivatives by silica‐supported heterogeneous oxidovanadium(V) coordination compound

“…[ 8 ] Breaking C=C bond and the formation of C=O bond under catalytic oxidation condition are the main reactions that form byproducts in the oxidation of styrene derivatives. [ 9 ] The selectivity of products in the catalytic oxidation of styrene derivatives can be controlled by adjusting factors such as the type and quantity of catalyst, oxidant, temperature, and solvent.…”

Recent advances in oxidative catalytic applications of polyoxovanadate-based inorganic–organic hybrids

“…It is worth mentioning that the catalyst has good universal applicability and cyclic utilization. 57…”

“…It is worth mentioning that the catalyst has good universal applicability and cyclic utilization. 57 3.1.6 Oxidative degradation of lignin. Lignin, as a biomass material of the second largest resource in the plant kingdom after cellulose, has a wide source and huge yields.…”

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

“…One of the most well-known organic reactions that can be catalyzed with POM is the Knoevenagel condensation reaction . As this is a key reaction for the synthesis of other chemicals, many attempts have been dedicated to develop efficient catalysts, such as Si-substituted polyoxovanadates, chitosan nanofiber, porous zeolite imidazolate framework, that can promote it under mild reaction conditions…”

“…8 One of the most well-known organic reactions that can be catalyzed with POM is the Knoevenagel condensation reaction. 9 As this is a key reaction for the synthesis of other chemicals, many attempts have been dedicated to develop efficient catalysts, such as Si-substituted polyoxovanadates, 10 chitosan nanofiber, 11 porous zeolite imidazolate framework, 12 that can promote it under mild reaction conditions Similar to most POMs, the main challenge of WD is its high solubility in conventional solvents that renders its recovery and reuse arduous. To circumvent this issue, POMs have been heterogenized through stabilization on biobased and synthetic supports 13 or encapsulation within porous compounds.…”