Magnetic nanoparticle-supported imidazole tribromide: a green, mild, recyclable and metal-free catalyst for the oxidation of sulfides to sulfoxides in the presence of aqueous hydrogen peroxide

Abstract

Imidazole tribromide immobilized on magnetic nanoparticles as a bromine source was prepared and characterized by X-ray diffraction (XRD), thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FT-IR), energy dispersive X-ray spectroscopy (EDX), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and vibrating sample magnetometer (VSM) techniques. The high catalytic activity of this novel catalyst was investigated in the oxidation of sulfides to sulfoxides using aqueous hydrogen peroxide as an oxidant at room temperature under solvent-free conditions. More importantly, the catalyst could be easily recovered by an external magnet and reused five times without any significant loss of catalytic activity.

A solvent-free solid catalyst for the selective and color-indicating ambient-air removal of sulfur mustard

“…Given their selective sulfoxidation activity in solution, many studies have explored systems containing bromine (Br y ) and nitrogen oxide (NO x ) species. [21][22][23][24] More recently, this type of system was proven effective for sulfoxidation of the HD simulant, 2-chloroethyl ethyl sulfide (CEES), in acetonitrile. [25][26][27] However, despite promising results, (a) solid formulations of these oxidation catalysts to enable practical applications are unknown, (b) fundamental aspects of the complicated mechanism have eluded researchers, and (c) live agent (HD) studies are lacking.…”

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

“…In continuation of the exploration of novel and straightforward methodologies in selective oxidation of sulfides to sulfoxides, the catalytic efficiency of the synthesized nanocatalyst was studied in this reaction using H 2 O 2 as the oxidant under solvent‐free conditions at room temperature, which successfully resulted in high yield and high conversion of products (Scheme ).…”

A unique approach to magnetization of metal oxides: nano-Fe3O4@TDI@TiO2 as a highly efficient, magnetically separable and recyclable heterogeneous nanocatalyst

“…As part of our efforts in exploring heterogeneous catalysts for organic reactions, [13][14][15][16][17][18] we have designed, prepared and characterized nano-Fe 3 O 4 @TDI@TiO 2 as a highly efficient, magnetically separable and recyclable nanocatalyst as a novel class of heterogeneous catalysts (Scheme 1).…”