Selective and mild oxidation of sulfides to sulfoxides by oxodiperoxo molybdenum complexes adsorbed onto silica gel

Macromolecular peroxo complexes of Vanadium(V) and Molybdenum(VI): Catalytic activities and biochemical relevance

“…1,3,[10][11][12][13][14][15] It has been appreciated for at least 140 years that characteristic colour reactions may occur when hydrogen peroxide is added to solutions of transition metal derivatives. 16 Among the various d o transition metal peroxo systems, V(V), Mo(VI) and W(VI), which have clear structural and isoelectronic relationships, attract continuous research attention because of their versatility and selectivity as stoichiometric or catalytic oxidizing or oxo-transfer agent in a variety of organic oxidations such as epoxidation of alkenes, [17][18][19][20] oxidation of sulfides and sulfoxides, [21][22][23][24][25][26] primary and secondary alcohols, 27,28 as well as halide oxidation. [29][30][31][32] Besides these, the active involvement or relevance of these peroxometallates in haloperoxidase, 29,31,32 their insulino-mimetic, [33][34][35][36] anti-neoplastic 37 and enzyme inhibitory activity 38,39 have been well documented.…”

Some applications of zirconium(IV) tetrachloride (ZrCl4) and zirconium(IV) oxydichloride octahydrate (ZrOCl2.8H2O) as catalysts or reagents in organic synthesis

“…This transformation has been accomplished in a variety of ways [16][17][18][19][20][21][22][23][24][25][26][27][28]. During recent years, very useful procedures involving aqueous hydrogen peroxide (H 2 O 2 ) as the terminal oxidant, and a Lewis acid as an activator have been developed to promote this transformation [29], Very recently, H 2 O 2 /ZrCl 4 system has been applied as a selective method to oxidize sulfides efficiently to their sulfoxides or sulfones even in the presence of easily oxidized functional groups (Scheme 8) [30].…”

Oxodiperoxomolybdenum complex immobilized onto ionic liquid modified SBA-15 as an effective catalysis for sulfide oxidation to sulfoxides using hydrogen peroxide

“…Here, we present the next step in our research and report the preparation and characterization of a SILP based on mesoporous silica SBA-15, functionalized covalently with an imidazolium-based IL, and the use of this material in the oxidation of organic sulfides. The green advantages are (i) the use of easily available oxodiperoxomolybdenum complexes as catalysts, coming from economic and commercial MoO 3 , and efficient in oxidation reactions carried out in ILs [36][37][38][39][40]; (ii) the use of cheap and environmentally-benign aqueous hydrogen peroxide as oxidant [42,43]; (iii) favored selectivity to sulfoxide by the heterogeneization [44]; and, (iv) efficient catalyst recycling.…”