- A highly efficient reusable homogeneous copper catalyst for the selective aerobic oxygenation sulfides to sulfoxides
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Readily available copper showed efficient activity and great selectivity for the homogeneous catalysis of oxidation of sulfides to sulfoxides using molecular oxygen as the oxidant. The reaction proceeds under mild conditions in the presence of a catalytic amount of TEMPO. Importantly, the catalysts could be conveniently recovered and reused. And this methodology was proved to be applicable for the transformation of various aromatic and aliphatic sulfides into the corresponding sulfoxides with high conversion and high selectivity.
- Ren, Cheng,Fang, Runxing,Yu, Xiaochun,Wang, Shun
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Read Online
- Visible-Light-Induced Photoredox Catalysis of Dye-Sensitized Titanium Dioxide: Selective Aerobic Oxidation of Organic Sulfides
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TiO2 photoredox catalysis has recently attracted much interest for use in performing challenging organic transformations under mild reaction conditions. However, the reaction scheme is hampered by the fact that TiO2 can only be excit
- Lang, Xianjun,Zhao, Jincai,Chen, Xiaodong
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Read Online
- Two-dimensional crystalline covalent triazine frameworksviadual modulator control for efficient photocatalytic oxidation of sulfides
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Two-dimensional crystalline covalent triazine frameworks (2D-CTFs) are emerging 2D materials with the characteristics of fully annulated conjugated structures and aromatic nitrogen-rich skeletons. Due to the difficulty in the control of the polymerization
- Jin, Shangbin,Lang, Xianjun,Li, Xia,Tan, Bien,Wang, Xuepeng,Zhan, Zhen,Zhang, Siquan
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Read Online
- Tertiary amine mediated aerobic oxidation of sulfides into sulfoxides by visible-light photoredox catalysis on TiO2
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The selective oxidation of sulfides into sulfoxides receives much attention due to industrial and biological applications. However, the realization of this reaction with molecular oxygen at room temperature, which is of importance towards green and sustai
- Lang, Xianjun,Hao, Wei,Leow, Wan Ru,Li, Shuzhou,Zhao, Jincai,Chen, Xiaodong
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Read Online
- Green catalysis for the selective oxidation of sulfides with high turnover numbers in water at room temperature
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A hybrid catalyst based on monoprotonated divanadium-substituted phosphotungstate ([γ-HPV2W10O40]4?) was synthesized and used for the selective oxidation of sulfides. The catalytic system was carried out in water with hydrogen peroxide at room temperature. Unprecedented turnover numbers (TONs) for all substrates were obtained, which are much higher than previous reports.
- Zhao, Wei,Yang, Chunxia,Sun, Hongxian,Cheng, Zhiguo,Chang, Tao
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Read Online
- Extending aromatic acids on TiO2 for cooperative photocatalysis with triethylamine: Violet light-induced selective aerobic oxidation of sulfides
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Designing visible light photocatalysts with a metal oxide semiconductor as the starting material could expand a new horizon for the conversion and storage of solar energy. Here, the benchmark photocatalyst TiO2 was used to pursue this goal by a
- Lang, Xianjun,Li, Hui,Li, Xia,Sheng, Wenlong,Zhou, Jun
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supporting information
(2022/01/11)
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- Catalyst-free visible light-mediated selective oxidation of sulfides into sulfoxides under clean conditions
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A facile and efficient visible-light-mediated method for directly converting sulfides into sulfoxides under clean conditions without using any photocatalysts is reported. This method exhibited favourable compatibility with functional groups and afforded a series of sulfoxides with high selectivity and yields. Moreover, in order to shed more light on such a transformation, detailed mechanism studies were carried out both experimentally and theoretically. The readily accessible, low-cost and eco-friendly nature of the developed method will endow it with attractive applications in chemical synthesis.
- Fan, Qiangwen,Zhu, Longwei,Li, Xuhuai,Ren, Huijun,Wu, Guorong,Zhu, Haibo,Sun, Wuji
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supporting information
p. 7945 - 7949
(2021/11/01)
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- Sulfoxide and Sulfone Synthesis via Electrochemical Oxidation of Sulfides
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The oxidation of diaryl sulfides and aryl alkyl sulfides to the corresponding sulfoxides and sulfones under electrochemical conditions is reported. Sulfoxides are selectively obtained in good yield under a constant current of 5 mA for 10 h in DMF, while sulfones are formed as the major product under a constant current of 10 or 20 mA for 10 h in MeOH. The oxygen of both the sulfoxide and sulfone function is derived from water.
- Lee, Sunwoo,Park, Jin Kyu
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p. 13790 - 13799
(2021/10/12)
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- Bridging green light photocatalysis over hierarchical Nb2O5for the selective aerobic oxidation of sulfides
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Nb2O5is a colourless metal oxide that is very promising in areas such as energy storage and optical glasses. These applications depend on the superior redox properties of Nb2O5compared to those of other metal ox
- Ma, Xiaoming,Hao, Huimin,Sheng, Wenlong,Huang, Fengwei,Lang, Xianjun
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supporting information
p. 2214 - 2222
(2021/02/09)
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- Air atmospheric photocatalytic oxidation by ultrathin C,N-TiO2nanosheets
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Herein, we demonstrate the highly efficient photocatalytic sulfide oxidation reaction under mild conditions,i.e.in air, at room temperature and in the absence of a sacrificial reagent, co-catalyst or redox mediator, by using ultrathin C,N-TiO2nanosheets as a photocatalyst.
- Cheng, Xiuyan,Zhang, Jianling,Liu, Lifei,Zheng, Lirong,Zhang, Fanyu,Duan, Ran,Sha, Yufei,Su, Zhuizhui,Xie, Fei
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supporting information
p. 1165 - 1170
(2021/02/26)
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- Emodinas a novel organic photocatalyst for selective oxidation of sulfides under mild conditions
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Herein, we have developed naturally-occurringEmodin, which is commercially available at low-cost, as a novel organic photocatalyst for the first time.Emodinwas successfully employed in the selective oxidation of sulfides promoted by visible-light, deliver
- Li, Min,Lou, Jiangli,Rao, Yijian,Yuan, Zhenbo,Zhang, Yan
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p. 19747 - 19750
(2020/06/04)
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- Synthesis of an anthraquinone-containing polymeric photosensitizer and its application in aerobic photooxidation of thioethers
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Work on the synthesis of a polymeric photosensitizer and its application in the photooxidation of thioethers is reported herein. Firstly, the polymeric photosensitizer was designed and synthesized by the reaction of anthraquinone-2-carbonyl chloride (AQ-2-COCl) with poly(2-hydroxyethyl methacrylate) (PHEMA). Then, the visible light-induced photooxidation of thioethers under aerobic conditions was investigated. The results revealed that the reaction yielded sulfoxides highly chemoselectively in excellent yields with good substrate tolerance. Importantly, AQ-PHEMA could be easily recovered and reused more than 20 times without significant loss of the catalytic activity.
- Chen, Yang,Ding, Aishun,Hu, Jianhua
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p. 10661 - 10665
(2020/03/27)
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- Improved photocatalytic performance of covalent organic frameworks by nanostructure construction
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Here, we demonstrate for the first time the construction of covalent organic framework (COF) capsules with nanostructured surfaces, which combine advantages of highly accessible surface area, excellent light absorbance, and efficient separation of photoge
- Cheng, Xiuyan,Han, Buxing,Liu, Lifei,Tan, Dongxing,Tan, Xiuniang,Zhang, Bingxing,Zhang, Jianling
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supporting information
p. 4567 - 4570
(2020/05/05)
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- Hollow Anatase TiO2 Octahedrons with Exposed High-Index {102} Facets for Improved Dye-Sensitized Photoredox Catalysis Activity
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The high activity of exposed facets and large surface area have significant effects on the performance of photocatalysts because most of the photoreactivity properties of materials are related to surface processes. The strategy of combining high-index facets and a hollow structure into one material will provide a new way for designing effective photocatalysts, possessing active exposed facets and a large surface area at the same time. However, fabricating one material with both high-index facets and a hollow structure is still a great challenge due to their thermodynamic instability. Here, hollow anatase TiO2 octahedrons exposed with high-index (102) facets (HTO-102) were successfully fabricated for the first time by a facile hydrothermal method using HF and H2O2 as morphology controlling agents. Compared with two other catalysts (a solid sharp octahedron with (101) facets (SSO-101) and a hollow sharp octahedron with (101) facets (HSO-101)), HTO-102 particles exhibit a better photochemical activity for the selective aerobic oxidation of organic sulfides under visible-light irradiation. Experimental results and theoretical calculations indicate that the excellent photocatalytic activity of HTO-102 particles is mainly due to the synergistic effects of its hollow structure and exposed high-index (102) facets.
- Wang, Fan,Sun, Liming,Li, Yanan,Zhan, Wenwen,Wang, Xiaojun,Han, Xiguang
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supporting information
p. 4550 - 4555
(2018/04/23)
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- Improving the Visible Light Photocatalytic Aerobic Oxidation of Sulfides into Sulfoxides on Dye-Sensitized TiO2
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Visible light-driven interfacial redox reactions during dye-sensitized TiO2 are essential to meet the energy and environmental challenges in the form of dye-sensitized solar cells and sensitized degradation of organic pollutants. Inspired by th
- Hao, Huimin,Wang, Zhan,Shi, Ji-Long,Li, Xia,Lang, Xianjun
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p. 4545 - 4554
(2018/09/25)
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- Hydrophilic phase transfer catalyst based on the sulfoacid group and polyoxometalate for the selective oxidation of sulfides in water with hydrogen peroxide
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A hybrid catalyst, based on SO3H-fuctionalized quaternary ammonium and polyoxovanadometalate, was synthesized and used for the selective oxidation of sulfides in water at room temperature. The highest turnover numbers (TON) can reach up to 1536. The organic products with high yields can be easily separated and the catalytic system can be used several times with the retention of catalytic activity.
- Zhao, Wei,Yang, Chunxia,Liu, Kecheng,Yang, Ying,Chang, Tao
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supporting information
p. 447 - 451
(2017/02/05)
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- Highly selective oxidation of sulfides on a CdS/C3N4 catalyst with dioxygen under visible-light irradiation
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A CdS/C3N4 composite photocatalyst was fabricated by a facile method, and its structure, composition, and morphology were characterized in detail. The catalyst exhibited high photocatalytic product selectivity towards the oxidation o
- Xu, Yong,Fu, Zi-Cheng,Cao, Shuang,Chen, Yong,Fu, Wen-Fu
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p. 587 - 595
(2017/08/14)
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- Amine coupled ordered mesoporous (Co-N) co-doped TiO2: A green photocatalyst for the selective aerobic oxidation of thioether
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Usually oxygen cannot participate in the selective oxidation reaction of thioether to sulfoxide, which is attributed to its inactive feature. Although UV-light irradiation can activate O2, this process also results in UV-induced hole (hvb
- Zou, Mingming,Feng, Lu,Thomas, Tiju,Yang, Minghui
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p. 4182 - 4192
(2017/09/25)
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- Oxidation of organic sulfides by imidazolium fluorochromate: A kinetic and mechanistic approach
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The oxidation of organic sulfides by imidazolium fluorochromate resulted in the formation of the corresponding sulfoxides. The reaction is first order with respect to imidazolium fluorochromate. A Michaelis-Menten type kinetics was observed with respect t
- Mathur, Lokesh,Choudhary,Prakash, Om,Sharma, Pradeep K.
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p. 2597 - 2603
(2014/06/09)
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- Synergistic combination of multi-ZrIV cations and lacunary keggin germanotungstates leading to a gigantic Zr24-cluster- Substituted Polyoxometalate
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Synergistic directing roles of six lacunary fragments resulted in an unprecedented Zr24-cluster substituted poly(polyoxotungstate) Na 10K22[Zr24O22(OH) 10(H2O)2(W2O10H) 2(GeW9O34)4(GeW8O 31)2]·85H2O (Na10K 22·1·85H2O), which contains the largest [Zr24O22(OH)10(H2O)2] (Zr24) cluster in all the Zr-based poly(polyoxometalate)s to date. The most remarkable feature is that the centrosymmetric Zr24-cluster- based hexamer contains two symmetry-related [Zr12O 11(OH)5(H2O)(W2O10H) (GeW9O34)2(GeW8O31)] 16- trimers via six μ3-oxo bridges and was simultaneously trapped by three types of different segments of B-α-GeW9O34, B-α-GeW8O 31, and W2O10. The other interesting characteristic is that there are two pairs of intriguing triangular atom alignments: one is composed of the Zr(2,4,6,8,11) and W21 atoms and the other contains the Ge(1-3), Zr(3,5,7,9,10,12) and W26 atoms, and the Zr5 atom is inside the triangle; a linking mode is unobserved. The oxygenation reactions of thioethers by H2O2 were evaluated when Na 10K22·1·85H2O served as a catalyst. Results show that it is an effective catalyst for oxygenation of thioethers by H2O2. The unique redox property of oxygen-enriched polyoxotungstate fragments and Lewis acidity of the Zr cluster imbedded in Na10K22·1·85H2O provide a sufficient driving force for the catalytic conversion from thioethers to sulfoxides/sulfones.
- Huang, Ling,Wang, Sa-Sa,Zhao, Jun-Wei,Cheng, Lin,Yang, Guo-Yu
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supporting information
p. 7637 - 7642
(2014/06/10)
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- Sulfoxide-to-sulfilimine conversions: Use of modified Burgess-type reagents
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Sulfoxides can directly be converted into N-cyanosulfilimines using a new Burgess-type reagent. By applying this strategy with a related reagent variant, synthetically valuable NH-sulfoximines have been prepared from sulfoxides via N-protected sulfilimines. The practical three-step reaction sequence is generally high yielding and applicable to a wide range of substrates. The sulfoxide-to-sulfilimine conversion can also be performed under solvent-reduced conditions in a ball mill. Copyright
- Hendriks, Christine M. M.,Lamers, Philip,Engel, Julien,Bolm, Carsten
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supporting information
p. 3363 - 3368
(2013/12/04)
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- Oxidation of organic sulfides by tetraethylammonium chlorochromate: A kinetic and mechanistic study
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The oxidation of organic sulfides by tetraethylammonium chlorochromate (TEACC) resulted in the formation of the corresponding sulfoxides. The reaction is first order with respect to both TEACC and the sulfide. The reaction is catalyzed by toluene-p-sulfon
- Sharma, Deepika,Pancharia,Vadera,Sharma, Pradeep K.
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experimental part
p. 315 - 326
(2012/01/04)
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- Kinetics and mechanism of the oxidation of organic sulfides with bis(pyridine)silver permanganate
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The oxidation of organic sulfides by bis(pyridine)silver permanganate (BPSP) resulted in the formation of the corresponding sulfoxides. The reaction is first order with respect to both BPSP and sulfides. The reaction is catalysed by hydrogen ions. The rat
- Banerji, Jayshree,Banerji,Kotai, Laszlo,Sharma, Deepika,Sharma, Pradeep K.
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scheme or table
p. 1879 - 1886
(2012/04/04)
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- Kinetics and mechanism of the oxidation of some organic sulfides by morpholinium chlorochromate
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The oxidation of organic sulfides by morpholinium chlorochromate (MCC) resulted in the formation of the corresponding sulfoxides. The reaction is first order with respect to both MCC and the sulfide. The reaction is catalyzed by toluene-p-sulfonic acid (T
- Malani, Neha,Baghmar, Manju,Sharma, Pradeep K.
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experimental part
p. 65 - 72
(2009/04/07)
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- An investigation by means of correlation analysis into the mechanisms of oxidation of aryl methyl sulfides and sulfoxides by dimethyldioxirane in various solvents
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Relative rate constants have been measured for the oxidation of aryl methyl sulfides and sulfoxides by dimethyldioxirane in acetone, in mixtures of acetone with aprotic co-solvents of both higher and lower relative permittivity, and in aqueous acetone mixtures. Correlation analyses of the effects of substituents in the different solvents show that, with one exception, reactions take place via a single step mechanism in which the formation of the new SO bond and the elimination of acetone occur concertedly. The exception was oxidation of the sulfides in aqueous acetone containing the highest proportion of water of those studied (20% v/v). Here, the behaviour of the reaction is consistent with a two-step mechanism in which the oxidant reversibly attacks the sulfide to form an open-chain sulfonium betaine that subsequently fragments to sulfoxide and acetone. There is no evidence for the participation of an intermediate dioxathietane as has been found in the case of sulfide oxidations by (trifluoromethyl)methyldioxirane in CH2Cl2 and similar aprotic solvents. It is not justified to generalise a mechanism involving a betaine, with or without a derived dioxathietane, to the reactions of dimethyldioxirane in acetone. This journal is The Royal Society of Chemistry.
- Hanson, Peter,Hendrickx, Ramon A.A.J.,Smith, John R. Lindsay
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p. XX745-761
(2008/09/17)
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- Kinetics and mechanism of the oxidation of organic sulphides by quinolinium bromochromate
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The oxidation of thirty-four sulphides by quinolinium bromochromate (QBC) has been found to result in the formation of the corresponding sulphoxides. The reaction is first order with respect to both QBC and the sulphide. The reaction is catalysed by hydro
- Dhariwal, Varsha,Yajurvedi, Deeksha,Sharma, Pradeep K.
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p. 1158 - 1164
(2007/10/03)
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- Kinetics and mechanism of oxygenation of aromatic sulfides and arylmercaptoacetic acids by peroxomonophosphoric acid
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The oxygenation of aryl methyl sulfides and diaryl sulfides by peroxomonophosphoric acid in acetonitrile-water mixture follows an overall second-order kinetics, first-order in each reactant. The study of the influence of [H+] on the oxidation of phenyl methyl and diphenyl sulfides reveals that H2PO5- and HPO52- are the oxidising species in the oxidation process. In substituted phenyl methyl sulfides and diphenyl sulfides, the rate of oxygenation is accelerated by electron-donating substituents and retarded by electron-withdrawing groups, indicating the nucleophilic displacement by the sulfide sulfur on the peroxide oxygen. The negative ρ value obtained in the correlation analysis of rate constants with σ constants also shows the formation of a more positively charged sulfur species in the rate-limiting step. Studies with different alkyl phenyl sulfides (C6H5SR; R=Me, Et, Pri or But) indicate that the rate is retarded by bulky R groups. Similar kinetic results are also obtained in the peroxomonophosphoric acid oxidation of sodium phenylmercaptoacetate. On the basis of the kinetic studies, a common mechanism has been proposed.
- Thenraja, Duraisamy,Subramaniam, Perumal,Srinivasan, Chockalingam
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p. 4283 - 4290
(2007/10/03)
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- Kinetics and mechanism of oxidation of aromatic sulfides and arylmercaptoacetic acids by N-chlorosuccinimide
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Kinetic measurements of the oxidation of divalent organic sulfur compounds by N-chlorosuccinimide in acetonitrile-water mixture at constant [H+] show that the reaction is first order in both the oxidant and the organic sulfur compound. While th
- Thenraja, Duraisamy,Subramaniam, Perumal,Srinivasan, Chockalingam
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p. 2125 - 2129
(2007/10/03)
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- Kinetics and mechanism of the oxidation of organic sulfides by quinolinium fluorochromate
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The oxidation of organic sulfides by quinolinium fluorochromate (QFC), to the corresponding sulfoxides, is first order with respect to QFC. Michaelis-Menten type kinetics were observed with respect to the sulfide. The correlation analyses of the rate of t
- Bhandari, Abhinav,Sharma, Pradeep. K.,Banerji, Kalyan K.
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p. 653 - 675
(2007/10/03)
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- Kinetics and correlation analysis of reactivity in oxidation of organic sulfides by hexamethylenetetramine-bromine
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The oxidation of organic sulfides by hexamethylenetetramine-bromine (HABR) to the corresponding sulfoxides is first order with respect to HABR. Michaelis-Menten-type kinetics were observed with respect to the sulfide. It is proposed that HABR itself is th
- Choudhary, Kirti,Suri, Deepa,Kothari, Seema,Banerji, Kalyan K.
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p. 283 - 292
(2007/10/03)
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- Surface-mediated reactions. 8. Oxidation of sulfides and sulfoxides with tert-butyl hydroperoxide and OXONE
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Silica gel and alumina have been found to mediate the oxidation of sulfides and sulfoxides with (CH3)3COOH and OXONE. With all combinations except (CH3)3COOH/alumina, sulfides were oxidized with reasonably good selectivity to sulfoxides. These studies afforded insights into the mechanisms of surface-mediated processes. Adsorption studies, combined with the effect of partial silylation of silica gel, indicate that oxidation of sulfides by (CH3)3COOH/silica gel occurs at least predominantly via nucleophilic attack by the sulfide on (CH3)3COOH, which is activated by being bound to isolated silanol sites on the silica gel surface (Scheme 2), whereas oxidation of sulfoxides involves nucleophilic attack by (CH3)3COOH on the sulfoxide, which is activated by being bound to associated silanol sites (Scheme 3). Oxidation of sulfoxides by (CH3)3COOH/alumina involves attack of (CH3)3COO- on the sulfoxide bound to free Al+ sites on the surface (Scheme 4B). Mediation of oxidation by OXONE involves instead activation by its being dispersed on the surface of the adsorbent, providing contact between KOSO2OOH, the oxidizing component, and the substrate. With silica gel, binding involves the associated silanol sites (Scheme 5). It is proposed that this is a general model for surface mediation of inorganic salts.
- Kropp, Paul J.,Breton, Gary W.,Fields, John D.,Tung, Jesse C.,Loomis, Brian R.
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p. 4280 - 4285
(2007/10/03)
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- Oxygenation Reaction of Organic Sulfides with Oxochromium(V) Ion
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The selective oxidation of 19 alkyl aryl sulfides to sulfoxides with three oxochromium(V) complexes in an acetonitrile-water mixture is overall second order, first order in the oxidant and in the substrate. Sulfides containing electron-attracting substitu
- Ganesan, Tharumeya Kuppusamy,Rajagopal, Seenivasan,Bharathy, Jesuraja Bosco,Mohamed Sheriff, Ambalam I.
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- Kinetics and Mechanism of the Oxidation of Organic Sulfides by Bis(2,2′-bipyridyl)copper(II) Permanganate
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The oxidation of 34 sulfides by bis(2,2′-bipyridyl)copper(II) permanganate (BBCP) resulted in the formation of the corresponding sulfoxide. The reaction is first order with respect to BBCP. Michaelis-Menten type kinetics were observed with respect to the
- Bohra, Anupama,Sharma, Pradeep K.,Banerji, Kalyan K.
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p. 3562 - 3567
(2007/10/03)
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- Kinetics and Mechanism of the Oxidation of Organic Sulfides by Pyridinium Bromochromate
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The oxidation of thirty-four sulfides by pyridinium bromochromate (PBC) resulted in the formation of the corresponding sulfoxides.The reaction is first order with respect to both PBC and the sulfide.The oxidation was studied in 19 different solvents.An an
- Loonker, Kavita,Sharma, Pradeep K.,Banerji, Kalyan K.
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p. 1262 - 1285
(2007/10/03)
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- Oxidation of Alkylthio Substituted Tricarbonyl(η6-arene)chromium(0) Complexes to Alkylsulfinyl Substituted Tricarbonyl(η6-arene)chromium(0) Complexes
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Dimethyldioxirane efficiently oxidises tricarbonylchromium(0) complexes of alkylthio substituted arenes to tricarbonylchromium(0) complexes of alkylsulfinyl substituted arenes.The diastereoselectivity of oxidation of ortho substituted complexes, which was determined by inter alia X-ray crystal structure analyses of tricarbonyl6-1-methoxy-2-(methylsulfinyl)benzene>-chromium(0) 20x, 6-1-(tert-butylsulfinyl)-2-methoxybenzene>tricarbonylchromium(0) 23x and tricarbonyl6-1-(ethylsulfinyl)-2-methoxybenzene)chromium(0) 21y, is dependent on the alkylthio substituent and is reversed when this substituent is changed from methylthio to tert-butylthio.
- Perez-Encabo, Alfonso,Perrio, Stephane,Slawin, Alexandra M. Z.,Thomas, Susan E.,Wierzchleyski, Adam T.,Williams, David J.
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p. 629 - 642
(2007/10/02)
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- Kinetics and Mechanism of Oxidation of Organic Sulphides by Lead Tetraacetate
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Kinetics of oxidation of thirty-three organic sulphides, comprising monosubstituted aryl methyl sulphides and alkyl phenyl sulphides, by lead tetraacetate (LTA), to yield the corresponding sulphoxides, have been studied.The reaction is first order with re
- Banerji, Kalyan K.
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p. 759 - 763
(2007/10/02)
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- A General Procedure for the Selective Oxidation of Sulfides to Sulfoxides by Nitric Acid: Tetrabromoaurate(III) Catalyst in a Biphasic System
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Tetrabromoaurate(III) is an efficient catalyst for the oxidation of sulfides to sulfoxides by nitric acid in a biphasic system (nitromethane/water).The system is selective and can be applied to the oxidation of any type of dialkyl and alkyl aryl sulfide and also of diaryl sulfides activated by electron-releasing substituents.The nature of the active species has been investigated in relation to the mechanistic aspects.
- Gasparrini, Francesco,Giovannoli, Mario,Misiti, Domenico,Natile, Giovanni,Palmieri, Gianni
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p. 1323 - 1328
(2007/10/02)
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- Mechanism of Picolinic-acid-catalysed Chromium(VI) Oxidation of Alkyl Aryl and Diphenyl Sulphides
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The kinetics of picolinic acid (PA)-catalysed Cr(VI) oxidation of organic sulphur compounds have been studied with several alkyl aryl sulphides and diphenyl sulphides in acetic acid-water mixtures.The PA-catalysed oxidation follows third-order kinetics, f
- Srinivasan, Chockalingam,Rajagopal, Seenivasan,Chellamani, Arunachalam
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p. 1839 - 1843
(2007/10/02)
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- MECHANISM OF THE OXIDATION OF ORGANIC SULPHIDES BY PERMANGANATE ION
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The kinetics of the oxidation of number of aryl methyl, alkyl phenyl, dialkyl and diphenyl sulphides by permanganate ion to yield the sulphoxides, have been studied.The reaction is first order with respect to the sulphide and permanganate and is independe
- Banerji, Kalyan K.
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p. 2969 - 2976
(2007/10/02)
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- Kinetics of the Oxidation of Organic Sulphides by Pyridinium Fluorochromate
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The kinetics of the oxidation of a number of monosubstituted aryl methyl, alkyl phenyl, dialkyl, and diphenyl sulphides by pyridinium fluorochromate (PFC) to yield the corresponding sulphoxides have been studied.The reaction is first order with respect to
- Banerji, Kalyan K.
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p. 2065 - 2070
(2007/10/02)
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- KINETICS AND MECHANISM OF OXIDATION OF SUBSTITUTED PHENYL METHYL SULPHIDES BY N-BROMOACETAMIDE
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The kinetics of oxidation of several substituted phenyl methyl sulphides by N-bromoacetamide (NBA) in 80percentacetonitrile-20percentwater (v/v) mixture are presented.The reaction is first order with respect to both sulphide and NBA and second order in Hg(II).The rate of the reaction exhibits inverse dependence on both and .Electron-releasing substituents present in the phenyl ring of the sulphides accelerate the rate while electron-withdrawing ones retard it.The results are in accord with a mechanism involving the reaction between NBA-Hg(II) and sulphide-Hg(II) complexes in the slow rate-limiting step affording a sulphonium ion which hydrolyses in a subsequent fast step to the sulphoxide.
- Perumal, Subbu,Alagumalai, Sakkiah,Selvaraj, Sangavanaicker,Arumugam, Natesan
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p. 4867 - 4872
(2007/10/02)
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- Mechanism of the Oxidation of Alkyl Aryl and Diphenyl Sulfides by Chromium(VI)
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The mechanism of Cr(VI) oxidation of organic sulfur compounds has been investigated by studying the rates of oxidation of 17 alkyl aryl sulfides and 6 diphenyl sulfides respectively in 50percent (v/v) aqueous acetic acid and 75:25 acetic acid-water (v/v)
- Srinivasan, Chockalingam,Chellamani, Arunachalam,Rajagopal, Seenivasan
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p. 1201 - 1205
(2007/10/02)
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- Mechanism of the Oxidation of Sulphides with Sodium Periodate
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The kinetics of the oxidation of RSAr, R2S, and (CH2)nS sulphides with NaIO4 yielding sulphoxides were investigated in ethanol-water solutions, and the rate equation v = k2 was found to be valid.The observed substituent (ρ -1
- Ruff, Ferenc,Kucsman, Arpad
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p. 683 - 688
(2007/10/02)
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- Substituent Effects and Mechanism of Oxidation of some Aryl Methyl Sulphides with Vanadium(V)
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Oxidation of aryl methyl sulphides by vanadium(V) in aqueous acetic acid follows overall second order kinetics, first order each in and .Electron-donating substituents in the benzene ring accelerate the rate while electron-withdrawing one
- Satyanarayana, P. V. V.,Rao, Y. Nageswara,Rao, N. Nageswara
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- Mechanism of the Oxidation of Alkyl Aryl Sulfides by Phenyliodoso Diacetate
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The rates of oxidation of 16 alkyl aryl sulfides by phenyliodoso diacetate have been studied in acetonitrile-water mixtures.Those sulfides containing electron-donating groups in the benzene ring accelerate the rate while those with electron-withdrawing gr
- Srinivasan, Chockalingam,Chellamani, Arunachalam,Kuthalingam, Packiam
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p. 428 - 431
(2007/10/02)
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- Mechanism of the Oxidation of Alkyl Aryl Sulphides by Peroxodiphosphate
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The kinetics of oxidation of alkyl aryl sulphides by peroxodiphosphate ion were investigated in 50percent (v/v) aqueous acetic acid.At constant and ionic strength, the reaction is second-order, first order in sulphide and in peroxodiphosphate.An an
- Srinivasan, Chockalingam,Kuthalingam, Packiam,Arumugam, Nateson
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p. 170 - 175
(2007/10/02)
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