Supported vanadium Schiff bases complex on nano silica: a heterogeneous catalyst for the selective oxidation of sulfides and alcohols

Heterogeneous vanadium Schiff base complexes in catalytic oxidation reactions

“…It was confirmed that the reaction gave excellent selectivity, conversion, and high yield, while the catalyst is easy to separate, chemically stable and recyclable with no desorption during epoxidation reaction. 80 As proven by Dabiri et al 81 the use of catalyst is essential and plays a vital role in the selectivity and yield obtained in the oxidation of sulfides to the sulfoxide; little sulfoxide was formed in the absence of catalyst while the addition of only vanadium catalyst (in the absence of SiO2) or only SiO2 do not bring a significant yield unless the in situ catalyst is prepared and used, which gave an excellent and improved yield. The catalyst VSBC@NS 23, as shown in Fig.…”

Sandwich type polyoxometalates encapsulated into the mesoporous material: synthesis, characterization and catalytic application in the selective oxidation of sulfides

“…Recently, the use of polyoxometalates was promising not only due to bifunctional redox acid catalysts properties but also due to their unusual properties such as high charges, low cost and low environmental impact. [51][52][53] The reaction initially performed in the presence of 5.85 mmol of H 2 O 2 as an oxidant, employing 1 mmol (0.17 mL) diphenyl sulde and 50 mg of catalyst in CH 3 CN (2.5 mL) at room temperature. In order to nd the optimum reaction conditions, the effect of different reaction parameters such as the amount of catalyst, the stoichiometry of H 2 O 2 respect to the catalyst and substrate, solvent, reaction time, different dosages of POM into MIL-101 and the catalytic activities of the different catalysts on the selectivity and conversion of the oxidation reaction were studied.…”

Nickel(II) Schiff base complex supported on nano‐titanium dioxide: A novel straightforward route for preparation of supported Schiff base complexes applying 2,4‐toluenediisocyanate

“…Organosulfur compounds such as sulfoxides and sulfones are very important compounds in organic chemistry . In particular, sulfoxides are good chemicals, medicine and valuable intermediates in the synthesis of advantageous chemically and biologically active molecules . Various types of oxidants have been used for the oxidation reaction of sulfides.…”