123-93-3Relevant articles and documents
Spectroscopic investigation on kinetics, thermodynamics and mechanism for electron transfer reaction of iron(III) complex with sulphur centered radical in stimulated biological system
Deepalakshmi,Sivalingam,Kannadasan,Subramaniam,Sivakumar,Brahadeesh
, p. 315 - 321 (2014)
Electron transfer reactions of biological organic sulphides with several metal ions to generate sulphide radical cations are a great concern in biochemical process. To understand the mechanism, a stimulated biological system having model compounds, iron(III)-bipyridyl complex with thio-diglycolic acid (TDGA) was investigated. Spectroscopic study reveals the kinetics and thermodynamics of the reaction in aqueous perchloric acid medium. The reaction follows first and fractional order of 0.412 with respect to [Fe(bpy) 3]3+ and TDGA, respectively. The oxidation is insensitive to variation in [H+] but slightly decreases with increase in ionic strength ([I]). Addition of acrylamide, a radical scavenger has no effect on the rate of the reaction. The high negative value of ΔS# (-74.3 ± 1.09 J K-1 mol-1) indicates the complex formed has a definite orientation higher than the reactants. Based on the above results, a suitable reaction mechanism for this reactionis proposed.
Thiomorpholine and morpholine oxidation by a cytochrome P450 in Mycobacterium aurum MO1. Evidence of the intermediates by in situ 1H NMR
Combourieu, Bruno,Poupin, Pascal,Besse, Pascale,Sancelme, Martine,Veschambre, Henri,Truffaut, Nicole,Delort, Anne-Marie
, p. 433 - 442 (1998)
Spectrophotometric assays of Mycobacterium aurum MO1 cells extracts gave evidence of a soluble cytochrome P450, involved in the degradative pathway of morpholine, a waste product from the chemical industry. In order to get further information, the kinetics of the biodegradation of the sulfur analogue thiomorpholine was monitored by using in situ nuclear magnetic resonance (NMR). This technique allowed the identification of two intermediates: the sulfoxide of thiomorpholine resulting from S-oxidation and thiodiglycolic acid owing to ring cleavage. The S-oxidation (S ← SO) represents one of the well-known reactions catalyzed by cytochromes P450. The inhibitory effect of metyrapone, a cytochrome P450 inhibitor, on the thiomorpholine and morpholine degradative abilities of M. aurum MO1 confirmed the involvement of a cytochrome P450. These results and the decrease of the rate of formation of the first intermediate during the morpholine degradation, 2-(2-aminoethoxy) acetate, proved the key role of the cytochrome P450 in the early events of the biodegradation, i.e, in the C - N bond cleavage.
Oxidation of thiol compounds by molecular oxygen in aqueous solutions
Bagiyan,Koroleva,Soroka,Ufimtsev
, p. 1135 - 1141 (2003)
Side self-oxidation of thiols was studied. It was found that these reactions in neutral and alkaline solutions are induced by impurities of variable-valence metals. The ability of transition metals to catalyze oxidation of thiols changes in the order Cu > Mn > Fe > Ni ? Co. The plot of the self-oxidation rate vs. pH passes through a maximum whose position on the pH scale depends on both the nature of metal and the structure of the thiol oxidized. For thiols having different structures, the kinetic orders in reactions catalyzed by copper ions differently vary with pH, which is apparently associated with the formation of complexes possessing different catalytic activity.
A cogeneration process for producing sulfur and sulfur on behalf of acetate acid diester method (by machine translation)
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Paragraph 0076; 0078, (2018/12/02)
The invention technical field of chemical synthesis, in particular relates to a methionine as raw material production process for producing sulfur and sulfur on behalf of acetate acid diester method. The invention states the payment proportional to production for preparing sulfur and sulfur on behalf of acetate acid diester method, in order to methionine and halogenated acetic acid as the raw material, the preparation comprising a homoserine lactone hydrohalide salt (IV), a sulfur acetate (I) and sulfur on behalf of the b b acid diester (II) of the three kinds of chemical products, and each between the products easy to separate and purify. (by machine translation)
Zirconium oxide complex-functionalized MCM-41 nanostructure: An efficient and reusable mesoporous catalyst for oxidation of sulfides and oxidative coupling of thiols using hydrogen peroxide
Hajjami, Maryam,Shiri, Lotfi,Jahanbakhshi, Azar
, p. 668 - 673 (2015/09/28)
Zirconium oxide complex-functionalized mesoporous MCM-41 (Zr-oxide@MCM-41) as an efficient and reusable catalyst is reported for the oxidation of sulfides into sulfoxides using hydrogen peroxide (H2O2) as the oxidant, with short reaction times in good to excellent yields at room temperature under solvent-free conditions. Also, a simple and efficient method is reported for the oxidative coupling of thiols into corresponding disulfides in good to high yields using H2O2 as oxidant in the presence of Zr-oxide@MCM-41 as recoverable catalyst in ethanol at room temperature. A series of sulfides and thiols possessing functional groups was successfully converted into corresponding products. After completion of reactions the catalyst was easily separated with simple filtration from the reaction mixture and reused for several consecutive runs without significant loss of catalytic efficiency. The mesoporous catalyst was characterized using Fourier transform infrared spectroscopy, Brunauer-Emmett-Teller surface area measurements, X-ray diffraction, transmission and scanning electron microscopies, energy-dispersive X-ray spectroscopy and thermogravimetric analysis.
Method for preparing aromatic diphenyl thioethers
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, (2008/06/13)
The invention concerns a method for preparing aromatic diphenyl thioethers. More particularly the invention concerns the preparation of 4-chloro-4′-thiomethyldiphenylether. The inventive method for preparing an aromatic diphenyl thioether is characterised in that it consists in reacting in an aqueous medium a diazonium salt of an aromatic diphenyl compound with a disulphide sulphur compound, in the presence of an efficient amount of a coupling catalyst.
Electron Transfer Reactions of 2,2'-Thiodiethanoic Acid in Aqueous Solutions: A Pulse Radiolysis Study
Maity, Dilip K.,Mohan, Hari
, p. 2229 - 2234 (2007/10/02)
OH radicals are observed to react with 2,2'-thiodiethanoic acid in aqueous solutions containing a high concentration of HClO4 by an inner-sphere electron transfer reaction mechanism to form solute dimer (λ(max)=520nm) radical cations at high solute concentrations.The stability constant for the dimer radical cation has been determined to be 68 dm3 mol-1 at 25 deg C.The decay kinetics of solute dimer radical cation is discussed in detail and deprotonation of the solute radical cation is found to be the rate-determining step.The solute dimer radical cations are able to undergo electron transfer reactions with Br- and form a transient band (λmax=385nm) which is assigned to a bromine-solute adduct.
THE REACTION OF DICHLOROACETIC ACID WITH HYDROSULFIDES
Darles, Pascale,Labat, Yves,Vallee, Yannick
, p. 43 - 46 (2007/10/02)
The main product of the reaction of dichloroacetic acid with hydrosulfides is dithioglicolic acid.By-products are sulfur, thioglicolic acid, and polysulfides.---Key words: dichloroacetic acid, hydrosulfides, dithioglycolic acid, gem-dichlorides; reduction.
