Nanoparticle catalysed oxidation of sulfides to sulfones by in situ generated H2O2 in supercritical carbon dioxide/water biphasic medium

Abstract

In a one-pot reaction, hydrogen peroxide generated from H(2) and O(2) on a Pd catalyst was utilised as oxidant for the TiO(2) catalyzed conversion of a sulfide to a sulfone. This transformation, where two different nanoparticle catalysts were employed in a supercritical carbon dioxide/water biphasic system, demonstrates the potential of compartmentalising catalytic processes in consecutive reactions.

Hydrophobic Modification of Pd/SiO2@Single‐Site Mesoporous Silicas by Triethoxyfluorosilane: Enhanced Catalytic Activity and Selectivity for One‐Pot Oxidation

“…This one-pot oxidation reaction uses the unstable H 2 O 2 immediately after production without tedious isolation or purification steps. [4][5][6][7][8] A previous report described a highly efficient one-pot oxidation system using new core-shell catalysts with special attention paid to the precise architecture of two types of active sites. The catalyst was composed of a Pd-supported silica nanosphere core and a mesoporous silica shell containing atomically dispersed Ti or Fe sites.…”

A Concise Review on Synthesis of Sulfoxides and Sulfones with Special Reference to Oxidation of Sulfides

“…Besides these, H2O2 in combination with variety of catalysts have been most frequently used in the oxidative synthesis of sulfones. For instance, combination of Merrifield resin supported peroxomolybdenum (VI) compounds-H2O2 [136], PDDA-SiV2W10-H2O2 [137], polypyridiniumphosphorotungstate-H2O2 [138], MnSO4-H2O2 [139], trifluoroacetophenone-H2O2 [140], peroxometalate based polymer immobilised ionic liquid-H2O2 [141], polymer-immobilized peroxotungsten compound-H2O2 [142], silica bromide-H2O2 [143], TaC / NbC-H2O2 [144], cyanuric chloride-H2O2 [145], borax-H2O2 [146], silicasulfuric acid-H2O2 [147], TiO2 -H2O2 [148], sulfamic acid-H2O2 [149], and H2O2 in supercritical carbon dioxidewater [150], are few of the noteworthy and recently reported catalystoxidant combinations to effect oxidation of sulfides to sulfones. In addition to these, Jereb et al [151] reported a catalyst-free, solvent-free and functional group compatible protocol for the oxidation of sulfides to sulfones using 30 % H2O2 as the oxidant.…”

Cobalt aluminate nanoparticles supported on MIL-101 structure: catalytic performance investigation

“…Some examples can be found in the literature dealing with the oxidation of thioanisole catalyzed by metallic nanoparticles. 27,47,48 Despite reporting practically complete conversions in the oxidation of thioanisole, the catalysts require much longer reactions times than the CoAl-x@MIL(Cr) composites herein reported. Although having a higher surface area, the smaller nanoparticles (ca.…”