Keggin heteropolycompounds as catalysts for liquid-phase oxidation of sulfides to sulfoxides/sulfones by hydrogen peroxide

Abstract

H 4 PMo 11 VO 40 , H 5 PMo 10 V 2 O 40 and H 9 PMo 6 V 6 O 40 acids and an acidic pyridinium salt of H 4 PMo 11 VO 40 were synthesized. They were characterized by FT-IR and the variations of their acid properties were determined by titration with n-butylamine. They proved to be highly active and selective catalysts for the hydrogen peroxide oxidation of methyl phenyl sulfide to the corresponding sulfoxide or sulfone. The conversion and selectivity results may be explained in terms of the co-existence of acidic and oxidative properties in the catalysts. On the other hand, a convenient catalytic homogeneous procedure has been found to oxidize different sulfides to sulfoxides or sulfones, with 35% aqueous H 2 O 2 , using (PyH)H 3 PMo 11 VO 40 as catalyst. The oxidation reaction is carried out at room temperature for sulfoxides or 40°C for sulfones and requires a short time. The sulfoxides or sulfones were obtained with excellent yields by controlling the amount of H 2 O 2 .

Schiff base complexes of Ni, Co, Cr, Cd and Zn supported on magnetic nanoparticles: As efficient and recyclable catalysts for the oxidation of sulfides and oxidative coupling of thiols

“…Furthermore, Omeprazole and the pesticide Fipronil are two typical examples of the extensive application of these intermediates in pharmaceutical and fine chemical industries [22,23].…”

“…Therefore, many methods including different catalysts (homogeneous and heterogeneous catalysts) and various oxidants (e.g. metal oxidants, organic oxidant, peroxides, halogens, and air) have been used for the selective oxidation of organic sulfides and thiols [15][16][17][18][19][20][21][22][23][24][25]. Concerning the green oxidant, H 2 O 2 (with only H 2 O as a byproduct) in particular have received attention because of their environmental implications, readily available, high atom efficiency and lower costs involved than when using other oxidizing agents [26].…”

Green synthesis of 6-cyano-2,2-dimethyl-2-H-1-benzopyran and its subsequent enantioselective epoxidation

“…Complete characterization of the catalysts PMo 11 V and Py 3 -PMo 11 V was reported in a previous work [17,18]. Here, we present some relevant analysis of the catalysts in order to verify their characteristics.…”

Schiff base complex of Cu immobilized on MCM-41 as reusable catalyst for efficient oxidative coupling of thiols and oxidation of sulfides using hydrogen peroxide

“…In particular, some of biologically active sulfoxides play an important role as therapeutic agents such as antifungal, antibacterial, anti-ulcer, anti-atherosclerotic, antihypertensive and as well as psychotropics and vasodilators [21,22]. Furthermore, Omeprazole and the pesticide Fipronil are two typical examples of the extensive application of these intermediates in pharmaceutical and fine chemical industries [23,24].…”

“…For these reasons, many methods have been developed over the years to find efficient these organic transformations [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32]. For example, many methods have been reported in the presence of various catalysts and using different oxidant (e.g.…”