620-32-6Relevant academic research and scientific papers
Amphiphilic α-alkoxyalkyl hydroperoxide (α-AHP): A new oxidising reagent in aqueous media
Masuyama,Fukuoka,Wakita,Nojima
, p. 1727 - 1728 (2000)
Effective oxidation of benzyl sulfide to the corresponding sulfoxide in water was achieved by using amphiphilic α-alkoxyalkyl hydroperoxide (α-AHP) in the presence of a catalytic amount of MoO2(acac)2 under mild conditions.
Catalytic Activity of Polyfunctional Ionic Liquids in Oxidation of Model Sulfur Organic Compounds
Akopyan,Eseva,Polikarpova,Baigil’diev,Rodin,Anishnov
, p. 569 - 575 (2019)
Ionic liquids having acid centers in the imidazolium cation and molybdenum, tungsten, and vanadium atoms in the anion were synthesized and their catalytic activity in the oxidation of organosulfur compounds was examined. The highest catalytic activity is exhibited by the ionic liquid containing a molybdenum atom. The infl uence exerted by the reaction duration and by the amount of the ionic liquid and oxidizing agent on the conversion of methyl phenyl sulfide. The conditions are found for reaching the 100% conversion of methyl phenyl sulfide under mild conditions in the presence of the catalysts, ionic liquids [ionic liquid: 3-(carboxymethyl)-1-methyl-1H-imidazol-3-ium molybdate with S: Mo molar ratio = 24 ∶ 1, 2 h, 40°C, H2O2: S molar ratio = 12 ∶ 1]. The efficiency of using polyfunctional catalysts based on ionic liquids containing a Br?nsted acid center in the cation for oxidation of organosulfur compounds as compared with application of a simple mixture of an ionic liquid and a transition metal salt.
Modulation of photochemical oxidation of thioethers to sulfoxides or sulfones using an aromatic ketone as the photocatalyst
Zhao, Bin,Hammond, Gerald B.,Xu, Bo
supporting information, (2021/09/13)
We have developed an eco-friendly and chemo-selective photocatalytic synthesis of sulfoxides or sulfones via oxidation of sulfides (thioethers) at ambient temperature using air or O2 as the oxidant. An inexpensive thioxanthone was used as the photocatalyst. Our method offers excellent chemical yields and good functional group tolerance. The hydrogen bonding between hexafluoro-2-propanol (HFIP) and sulfoxides may play an important role in minimizing the over-oxidization of sulfoxides.
A μ-AsO4-Bridging Hexadecanuclear Ni-Substituted Polyoxotungstate
Lian, Chen,Li, Hai-Lou,Yang, Guo-Yu
, p. 3996 - 4003 (2021/04/07)
A novel tetrahedral μ-AsO4-bridging hexadecanuclear Ni-substituted silicotungstate (ST) Na21H10[(AsO4){Ni8(OH)6(H2O)2(CO3)2(A-α-SiW9O34)2}2]·60H2O (1) was made by the reactions of trivacant [A-α-SiW9O34]10- ({SiW9}) units with Ni2+ cations and Na3AsO4·12H2O and characterized by IR spectrometry, elemental analysis, thermogravimetric analysis (TGA), and powder X-ray diffraction (PXRD). 1 contains a novel polyoxoanion [(AsO4){Ni8(OH)6(H2O)2(CO3)2(A-α-SiW9O34)2}2]31- built by four trivacant Keggin [A-α-SiW9O34]10- fragments linked through an unprecedented [(AsO4){Ni8(OH)6(H2O)2(CO3)2}2]9+ cluster, where the tetrahedral AsO4 acts as an exclusively μ2-bridging unit to link multiple Ni centers; such a connection mode appears for the first time in polyoxometalate chemistry. Furthermore, the electrochemical and catalytic oxidation properties of compound 1 have been investigated.
Vanadium-catalyzed Selective Oxidation of Sulfides to Sulfoxides and Sulfones with H2O2
Chen, M.,Jia, A.-Q.,Zhang, P.-Z.,Zhang, Q.-F.,Zhou, W.-Y.
, p. 816 - 824 (2021/06/12)
Abstract: A direct selective approach to the oxidation of sulfides to sulfoxides andsulfones with H2O2 in moderate togood yields is developed. The reaction proceeds in the presence of 2 mol % ofVO(acac)2 at room temperature. All sulfoxides andsulfones were detected by gas chromatography, and the molecular structures of2-methylbenzyl 4-methylphenyl sulfone, 4-methylbenzyl 4-methylphenyl sulfone,2-bromobenzyl 4-methylphenyl sulfone, and 4-tert-butylbenzyl benzyl sulfone were determined by singlecrystal X-ray crystallography.
A {Ti6W4}-Cluster-Substituted Polyoxotungstate: Synthesis, Structure, and Catalytic Oxidation Properties
Li, Hai-Lou,Lian, Chen,Yang, Guo-Yu
supporting information, p. 14622 - 14628 (2021/10/01)
A novel Ti-W-O-cluster-substituted tungstoantimonate (TA), [H2N(CH3)2]3Na4H9[{Ti6W4O18(OH)(H2O)3}(B-α-SbW9O33)3]·20H2O (1), has been made by hydrothermal reactions of trivacant [B-α-SbW9O33]9- units, Ti4+ cations, and WO42- anions in the presence of [H2N(CH3)2]·Cl and structurally characterized. Intriguingly, the polyoxoanion of 1 is constructed from three [B-α-SbW9O33]9- units and a previously unobserved decanuclear heterometallic Ti-W-O cluster [Ti6W4O18(OH)(H2O)3]11+ ({Ti6W4}) that is comprised of an octahedral [Ti6WO6(H2O)3]18+ cluster and an edge-sharing [W3O12(OH)]7- fragment via six W-O-Ti/W linkers. Furthermore, studies on the catalytic oxidation properties reveal that 1 possesses good catalytic activity toward the oxidation reactions of various sulfides and cyclooctene based on the environmentally friendly oxidant H2O2.
{Ti6}/{Ti10} Wheel Cluster Substituted Silicotungstate Aggregates
Li, Hai-Lou,Lian, Chen,Yang, Guo-Yu
, p. 16852 - 16859 (2021/11/13)
Two novel Ti-oxo wheel cluster substituted silicotungstates (STs) [H2N(CH3)2]9H9[Ti6O6(SiW10O37)3]·11H2O (1) and [H2N(CH3)2]16H10[Ti10O11(SiW10O37)2(SiW9O35)2]·14H2O (2) have been made by hydrothermal reactions. The polyoxoanion of 1 is a ring-shaped trimer where a Ti6O6 ({Ti6}) wheel cluster is encapsulated by three divacant [SiW10O37]10- (SiW10O37) fragments. However, 2 is built by two divacant SiW10O37 units and two rare trivacant [SiW9O35]12- (SiW9O35) fragments and further installs an unprecedented Ti10O11 ({Ti10}) double-wheel cluster. To the best of our knowledge, 2 is rare in POM chemistry. Studies on the catalytic oxidation properties reveal that 1 exhibits high catalytic activity toward the oxidation of various sulfides using H2O2 as an oxidant. Furthermore, 1 can be facilely recycled and reused for at least five cycles without obvious loss of catalytic activity.
COMPOSITES, METHODS AND USES THEREOF
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Page/Page column 26, (2021/06/04)
The present invention relates, in general terms, to methods of catalysing a reaction, including the steps of contacting a chemical entity comprising a sulphide moiety with a composite and an oxidant. The composite acts as a heterogeneous catalyst to oxidise the sulphide moiety. The present invention also relates to composites, methods of synthesising the composites and its use as a catalyst thereof.
In Situ Generated Organic Peroxides in Oxidative Desulfurization of Naphtha Reformate
Akopyan, A. V.,Anisimov, A. V.,Eseva, E. A.,Sinikova, N. A.
, p. 472 - 482 (2021/06/01)
Abstract: The paper describes a method developed for the oxidation of organosulfur compounds using organic peroxides generated in situ under the action of atmospheric oxygen on gasoline fraction after reforming. Naphtha reformate that contained dibenzothiophene as a model substrate was subjected to oxidative desulfurization by organic peroxides generated in situ under atmospheric oxygen. The study examined various catalytic systems, including immobilized Anderson-type polyoxometalates, and initiators, which, in combination, provided effective generation of alkyl hydroperoxides, selective oxidation of organosulfur compounds in the hydrocarbon feedstock, and a high conversion rate.
Magneli-type tungsten oxide nanorods as catalysts for the selective oxidation of organic sulfides
D?ren, René,Hartmann, Jens,Leibauer, Benjamin,Panth?fer, Martin,Mondeshki, Mihail,Tremel, Wolfgang
, p. 14027 - 14037 (2021/10/19)
Selective oxidation of thioethers is an important reaction to obtain sulfoxides as synthetic intermediates for applications in the chemical industry, medicinal chemistry and biology or the destruction of warfare agents. The reduced Magneli-type tungsten oxide WO3?xpossesses a unique oxidase-like activity which facilitates the oxidation of thioethers to the corresponding sulfoxides. More than 90% of the model system methylphenylsulfide could be converted to the sulfoxide with a selectivity of 98% at room temperature within 30 minutes, whereas oxidation to the corresponding sulfone was on a time scale of days. The concentration of the catalyst had a significant impact on the reaction rate. Reasonable catalytic effects were also observed for the selective oxidation of various organic sulfides with different substituents. The WO3?xnanocatalysts could be recycled at least 5 times without decrease in activity. We propose a metal oxide-catalyzed route based on the clean oxidant hydrogen peroxide. Compared to other molecular or enzyme catalysts the WO3?xsystem is a more robust redox-nanocatalyst, which is not susceptible to decomposition or denaturation under standard conditions. The unique oxidase-like activity of WO3?xcan be used for a wide range of applications in synthetic, environmental or medicinal chemistry.
