Oxo‐vanadium(IV) Schiff base complex supported on modified MCM‐41: a reusable and efficient catalyst for the oxidation of sulfides and oxidative S–S coupling of thiols

Abstract

Oxo-vanadium(IV) Schiff base complex supported on MCM-41 as an organic-inorganic hybrid heterogeneous catalyst was synthesized with post-grafting of MCM-41 with 3-aminoropropyltrimethoxysilane and subsequent reaction with 3,4dihydroxybenzaldehyde and then complexation with oxo-vanadium acetylacetonate salt. The catalyst was analysed using a series of characterization techniques such as Fourier transform infrared spectroscopy, small-angle X-ray diffraction, nitrogen absorption isotherm, transmission electron microscopy and thermogravimetric analysis. The data collected provided evidence that the vanadium complex was anchored onto MCM-41. High catalytic activity of this catalyst was observed in the oxidation of various sulfides and thiols (into sulfoxides and disulfides, respectively) with urea hydrogen peroxide as oxidant in high to excellent yields and selectivity under mild conditions. The heterogeneous catalyst could be recovered easily and reused several times without significant loss in catalytic activity and selectivity.

Synthesis of new zirconium complex supported on MCM‐41 and its application as an efficient catalyst for synthesis of sulfides and the oxidation of sulfur containing compounds

“…In continuation of our previous efforts on the application of supported metal catalyst on mesoporous silica in organic reactions, herein, we report for the first time the synthesis and characterization an environmentally friendly and novel MCM‐41‐Adenine‐Zr catalyst (Scheme ), and investigated its application as an efficient heterogeneous and recoverable catalyst in the synthesis of sulfoxides (Scheme ), disulfides (Scheme ) and sulfides (Scheme ).…”

Palladium–S‐propyl‐2‐aminobenzothioate immobilized on Fe3O4 magnetic nanoparticles as catalyst for Suzuki and Heck reactions in water or poly(ethylene glycol)

“…Therefore, to combine the advantages of both heterogeneous and homogeneous catalysts, immobilization of homogeneous catalysts on nanoparticles is the best choice, which efficiently bridges the gap between heterogeneous and homogeneous catalysts . However, the supporting nanocatalysts such as MCM‐41, SBA‐15, TiO 2 nanoparticles, heteropolyacids, ionic liquids, carbon nanotubes or some polymers have various disadvantages such as difficult or time‐consuming and expensive separation of fine particles from a reaction mixture. Also some of them require high temperature for calcination or a lot of time and tedious conditions for their preparation.…”

Immobilization of a vanadium complex onto functionalized nanoporous MCM‐41 and its application as a catalyst for the solvent‐free chemoselective oxidation of sulfide to sulfoxide

“…In continuation of our previous work on oxidation of sulfides into sulfoxides, here we report an easy way to accomplish catalytic sulfoxidation with hydrogen peroxide in the presence of VO‐2A3HP‐MCM‐41 to afford sulfoxides in high yields and good chemoselectivity. Initially, the reaction without using any catalyst was conducted, giving the product in very low yield.…”