Green oxidation of sulfides to sulfoxides and sulfones with H2O2 catalyzed by ionic liquid compounds based on Keplerate polyoxometalates

Scaled‐up, selective and green synthesis of sulfoxides under mild conditions using (CeIII‐MoVI)Ox/aniline hybrid rods as an efficient catalyst

“…[15][16][17] Therefore, a large number of methods, procedures and oxidizing agents have been proposed for this type of transformation. [30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45] Despite the fact that amines such as aniline, pyridine and … are not an appropriate catalyst for the oxidation reactions, they can effectively modify the catalytic activity of the molybdates and molybdenum oxides due to the electronic interactions between these amines and the active sites in the hybrid structures. However, majority of these traditional protocols rely on the use of hazardous terminal oxidants with low content of effective oxygen, and high cost which can generate hazardous by-products.…”

“…This feature has stimulated the development of useful procedures for H 2 O 2 oxidation with various types of catalytic systems. [30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45] Despite the fact that amines such as aniline, pyridine and … are not an appropriate catalyst for the oxidation reactions, they can effectively modify the catalytic activity of the molybdates and molybdenum oxides due to the electronic interactions between these amines and the active sites in the hybrid structures. [12,14,[46][47][48][49] In recent years, owing to the redox properties of ceria, various types of ceria-based catalysts including cerium (IV) triflate, [50] ammonium cerium (IV) nitrate, [51] immobilized cerium alkyl phosphonate [52] and heterobimetallic cerium (IV) oxo clusters [53] are also widely used in selective oxidation of sulfides.…”

Recent Advances in Catalytic Oxidation of Organic Sulfides: Applications of Metal–Ionic Liquid Catalytic Systems

“…Fareghi-Alamdari et al reported the synthesis of a novel Keplerate anions-based ionic liquid catalyst (NH 4 ) 2 (MimAm) 40 [Mo 132 O 372 (CH 3 COO) 30 (H 2 O) 72 ] (Mo132-MimAM) through the self-assembly strategy. The resultant Keplerate anions-based ionic liquid was shown to be a green, highly efficient, and reusable catalyst for the selective oxidation of a variety of sulfides with H 2 O 2 to sulfoxides ( Fareghi-Alamdari, et al, 2017 ). The notable advantages of this method are high catalytic activity, good-to-high conversions (88–100%), excellent chemoselectivity (94.5–99%), simple work-up, and mild reaction conditions.…”

Recent Advances in the Electrochemical Synthesis of Organosulfur Compounds

“…Taking into account the value of organosulfur oxidation processes, many efforts have been made to develop more sustainable oxidative methods that have a major impact on the industry in reducing chemical waste, toxic by‐products and costs. Generally, the oxidation of organosulfur compounds can be achieved with peroxides, [7,8] hypervalent iodine reagents [9,10] or through photocatalytic processes [11] . Despite the various documented procedures, the oxidation processes for organosulfur compounds are often constrained by a difficult scale‐up, by low sustainability and the use of hazardous oxidising reagents.…”