- Selective oxidation of organic sulfides to sulfoxides using sugar derived cis-dioxo molybdenum(VI) complexes: Kinetic and mechanistic studies
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Six Mo(vi) complexes of 4,6-O-ethylidene-β-d-glucopyranosylamine derived ligands have been used for the selective oxidation of five organic sulfides to corresponding sulfoxides. The structure of a new sulfide [(((2-(phenylthio)phenyl)imino)methyl)naphthal
- Baig, Noorullah,Madduluri, Vimal Kumar,Sah, Ajay K.
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- Selective oxidation of sulfides to sulfoxides using hydrogen peroxide over Au/CTN-silica catalyst
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Chitosan (CTN) can be used as potential support to create environmentally friendly catalysts; however, chitosan's poor diffusion properties and low surface area limit its application. Direct deposition method on inorganic supports might be a feasible and simple solution, using core (silica nanosphere)-shell (chitosan) material as support, a series of Au/CTN-silica catalysts were prepared by inverse microemulsion system. These catalysts were active in catalyzing the oxidation of sulfides to sulfoxides with relative good conversion and high selectivity. This study confirms that the key factor governing catalytic performance of this catalyst should be the interaction between gold nanoparticles and N atoms.
- Wang, Fang,Liu, Cheng,Liu, Gui,Li, Wenxiu,Liu, Junhua
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- Selective Late-Stage Oxygenation of Sulfides with Ground-State Oxygen by Uranyl Photocatalysis
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Oxygenation is a fundamental transformation in synthesis. Herein, we describe the selective late-stage oxygenation of sulfur-containing complex molecules with ground-state oxygen under ambient conditions. The high oxidation potential of the active uranyl cation (UO22+) enabled the efficient synthesis of sulfones. The ligand-to-metal charge transfer process (LMCT) from O 2p to U 5f within the O=U=O group, which generates a UV center and an oxygen radical, is assumed to be affected by the solvent and additives, and can be tuned to promote selective sulfoxidation. This tunable strategy enabled the batch synthesis of 32 pharmaceuticals and analogues by late-stage oxygenation in an atom- and step-efficient manner.
- Li, Yiming,Rizvi, S. Aal-e-Ali,Hu, Deqing,Sun, Danwen,Gao, Anhui,Zhou, Yubo,Li, Jia,Jiang, Xuefeng
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supporting information
p. 13499 - 13506
(2019/08/21)
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- Sulfoxide and sulfone compounds, as well as selective synthesis method and application thereof
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The invention discloses a method for selectively synthesizing a sulfoxide compound shown as a formula (II) and a sulfone compound shown as a formula (III). In a reaction solvent, thioether (I) is usedas a reaction raw material and oxygen as an oxidation reagent, under the catalytic action of visible light and a photosensitive reagent; under the assistance of an additive, when a large-polarity proton-containing additive such as an acid and an alcohol or a solvent or an additive with excellent electron donating ability is used, a sulfoxide compound (II) is selectively generated; and when a small-polarity aprotic additive or a solvent is used, a sulfone compound (III) is selectively generated. The synthesis method has the advantages of easily available and cheap raw materials, simple reaction operation, mild reaction conditions, high yield and excellent functional group tolerance. According to the invention, synthesis and modification of some medicines are realized, and an efficient method for selectively constructing sulfoxide and sulfone compounds is provided for medicinal chemistry research.
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Paragraph 0045-0048; 0117-0120
(2019/12/02)
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- Nano-sized mesoporous sodium iron hydroxyphosphate supported gold: An effective catalyst for the oxidation of sulfides
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New nano-sized mesoporous sodium iron hydroxyphosphate (SIHP, Na4.55Fe(PO4)2H0.45O), synthesized by a microemulsion-hydrothermal synthesis method, with supported gold nanoparticles (AuNPs) could be a very effective catalyst for the selective oxidation of sulfides. The results showed that the SIHP material was an excellent catalyst support due to its special structure and the interactions between the AuNPs and the surface hydroxyl groups.
- Liu, Junhua,Liu, Gui,Liu, Cheng,Li, Wenxiu,Wang, Fang
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p. 2055 - 2059
(2016/04/26)
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- Synthesis and characterization of titanium complexes bearing sulfoxide groups and their catalytic behaviors in ethylene homo- and copolymerization
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Titanium complexes derived from 2,4-di-tert-butyl-6-((2-(arylsulfinyl) phenylimino)methyl)phenol are designed and synthesized. X-ray diffraction studies reveal that the complexes adopt distorted octahedral geometry with O(phenol), N(imine), and O(sulfoxide) coordinated with titanium. Combined with modified methylaluminoxane(MMAO), the complexes exhibit moderate to high activity to afford polyethylene even at 120 °C under 1 atm ethylene pressure. The complexes also show excellent capability in copolymerization of ethylene with either 1-hexene or norbornene. Results indicate that the introduction of sulfoxide groups could open the space around central metal and favors the insertion of bulky comonomers.
- Wang, Zheng,Peng, Ai-Qing,Sun, Xiu-Li,Tang, Yong
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p. 1144 - 1149
(2014/08/18)
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- Ion exchange resin catalyzed selective oxidation of sulfides to sulfoxides using hydrogen peroxide
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An efficient method for the selective oxidation of sulfides to sulfoxides under mild and environmentally safe conditions is achieved using hydrogen peroxide in the presence of Amberlyst 15 and Amberlite IR-400 at room temperature. This procedure can be ap
- Lakouraj, Moslem Mansour,Tajbakhsh, Mahmood,Tashakkorian, Hamed
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