1892-29-1Relevant articles and documents
Kinetics and Mechanisms of the Reduction of Cobalt(II) 4,4',4'',4'''-Tetrasulfophthalocyanine by 2-Mercaptoethanol under Anoxic Conditions
Leung, Ping-Sang K.,Betterton, Eric A.,Hoffmann, Michael R.
, p. 430 - 433 (1989)
The kinetics and mechanism of reduction of cobalt(II) 4,4',4'',4'''-tetrasulfophthalocyanine by 2-mercaptoethanol to yield cobalt(I) tetrasulfophthalocyanine and 2-hydroxyethyl disulfide under anoxic conditions were investigated and the following rate law was found: ν = -dIITSP>T/dt = 2K1TIITSP>T>/H+/Ka1 + Ka2/aH+)(1 + αT)>, where k2 is a rate constant for the rate-limiting electron-transfer step, and K1 is the equilibrium constant for the complexation of a CoTSP dimer with thioethanol; Ka1 and Ka2 are the apparent acid dissociation constants of HOC2H4SH and HOC2H4S-, respectively; α is K1/(1 + aH+/Ka1 + Ka2/aH+); aH+ is the hydrogen ion activity.A nonlinear least-squares fit of the experimental data to the above rate law gave k2 = 228 +/- 3.8 s-1 and K1 = 117 +/- 2.5 M-1 at 27 deg C at μ = 0.4 M.
Chalcogen-containing analogs of ethylene glycol and its derivatives
Vshivtsev,Levanova,Grabel'nykh,Sukhomazova,Albanov,Klyba,Zhanchipova,Russavskaya,Kochervin
, p. 608 - 613 (2008)
Ethylene chlorohydrin when reacted with elemental chalcogens or dimethyl dichalcogenides in the hydrazine hydrate-alkali system forms chalcogen-containing analogs of ethylene glycol and its derivatives (dichalcogenated β-diglycols, chalcogenated ethanols, and chalcogenated methyl cellosolves).
Sulfonated Co(II) phthalocyanines covalently anchored at organic polymers as catalyst for mild oxidation of mercaptans
Vashurin, Artur,Kuzmin, Ilya,Razumov, Mikhail,Pukhovskaya, Svetlana,Golubchikov, Oleg,Voronina, Alena,Shaposhnikov, Gennady,Koifman, Oscar
, p. 1159 - 1167 (2015)
Current work is devoted to covalent immobilization of sulfonated derivatives of cobalt phthalocyanines "Merox catalysts" on the surfaces of polypropylene and polyethylene terephthalate. Their catalytic activity in reaction of mild oxidation of sulfur compounds to disulfides with oxygen of the air was studied. Anchoring of the catalyst on this polymer prevents its leaching and promotes its efficient recovering and recycling without significant loss of catalytic activity.
Preparation and characterization of organically modified MCM-48 as heterogonous catalyst for oxidation of sulfides and thiols
Hajjami, Maryam,Yousofvand, Zakieh
, p. 1733 - 1740 (2015)
MCM-48 mesoporous synthesized and grafted with aminopropyl triethoxysilane (APTES) and subsequently reacted by isatin to obtain the imine of MCM-48. Addition of ZrOCl2.8H2O, leading to form the complex of Zr(IV)/isatin-MCM-48 as new Schiff base complex of zirconium(IV)-modified-MCM-48. The synthesized catalyst was characterized by XRD, TGA, FT-IR and BET. The resulting catalyst was efficient for selective oxidation of sulfides to sulfoxides and oxidation of thiols to disulfides with hydrogen peroxide. In this method isolation and reusability of catalyst have been investigated.
Activation Parameters for Thiolate-Disulfide Interchange Reactions in Aqueous Solution
Whitesides, George M.,Houk, Janette,Patterson, Mark A. K.
, p. 112 - 115 (1983)
We have measured activation parameters for thiolate-disulfide interchange reactions in water.Two disulfides were examined (Ellman's reagent and oxidized glutathione) and three thiols (2-mercaptoethanol, 1,3-dithiopropan-2-ol, and 1,4-dithiothreitol).These values are consistent with the interpretation of this reaction as an uncomplicated SN2 reaction of thiolate anion on the disulfide bond.
Thiol-dependent DNA cleavage by 3H-1,2-benzodithiol-3-one 1,1-dioxide
Breydo, Leonid,Gates, Kent S.
, p. 885 - 889 (2000)
Hydrodisulfides (RSSH) have previously been implicated as key intermediates in thiol-triggered oxidative DNA damage by the antitumor agent leinamycin. In an effort to better understand DNA damage by RSSH and to expand on the number and type of chemical systems that produce this reactive intermediate, the ability of 3H-1,2-benzodithiol-3-one 1,1-dioxide (11) to serve as a thio-dependent DNA cleaving agent has been investigated. The findings reported here indicate that reaction of 11 with thiols results in release of RSSH and subsequent oxidative DNA strand cleavage. (C) 2000 Elsevier Science Ltd. All rights reserved.
Oxo-vanadium(IV) unsymmetrical Schiff base complex immobilized on γ-Fe2O3 nanoparticles: A novel and magnetically recoverable nanocatalyst for selective oxidation of sulfides and oxidative coupling of thiols
Mahdian, Abolfazl,Ardakani, Mehdi Hatefi,Heydari-Bafrooei, Esmaeil,Saeednia, Samira
, (2021)
In this research, an unsymmetrical salen-type oxo-vanadium(IV) complex, [VO(salenac-OH)] (salenac-OH = [9-(2′,4′-dihydroxyphenyl)-5,8-diaza-4-methylnona-2,4,8-trienato](-2)), was synthesized and covalently immobilized on the surface of magnetic γ-Fe2
Kinetics and mechanism of oxygen atom abstraction from a dioxo-rhenium(VII) complex
Dixon, JaNeille,Espenson, James H.
, p. 4727 - 4731 (2002)
The kinetics of reaction between triarylphosphanes and two newly prepared dioxorhenium(VII) compounds has been evaluated. The compounds are MeReVII(O)2( O,S ) in which O,S represents an alkoxo, thiolato chelating ligand. With MeReO3, ligands derived from 1-mercaptoethanol and 1-mercapto-2-propanol form MeRe(O)2(met), 2, and MeRe(O)2(m2p), 3. These compounds persist in chloroform solution for several hours at room temperature and for 2-3 weeks at -22°C, particularly when water is carefully excluded. They were obtained as red oils with clean 1H NMR spectra, but attempts to obtain pure, crystalline products were not successful because one decomposition pathway shows a kinetic order >1. The fastest reaction occurs between P(p-MeOC6H4)3 and 2; k298 = 215(7) L mol-1 s-1 in chloroform at 25(1)°C. The other rate constants follow a Hammett correlation against 3σ, with ρ = -0.69(7). This study relates to oxygen atom transfer reactions catalyzed by MeReO(mtp)PPh3, 1, in which MeRe(O)2(mtp), 4, is a postulated intermediate that does not build up to a measurable concentration during the catalytic cycle. Compound 2 does not react with MeSTol, but MeS(O)Tol was formed when tert-butyl hydroperoxide was added. This suggests that equilibrium lies to the left in this reaction, 2 + MeSTol + L = MeReO(met)L + MeS(O)Tol, and is drawn to the right by a reaction between MeReO(met)L and the hydroperoxide. Triphenyl arsane does not react with 2, but thermodynamic versus kinetic barriers were not resolved.
Functionalized tellurium(II) thiolates: Tellurium bis(2-hydroxyethanethiolate) hydrate, the first H2O - Te(II) complex
Fleischer, Holger,Schollmeyer, Dieter
, p. 3705 - 3706 (2000)
Photochemically labile Te(CH2CH2OH)2 is the first tellurium(II) thiolate with functionalized side chains. Its H2O complex, Te(CH2CH2OH)2·H2O (see structure), is stabil
Silica sulfuric acid/NaNO2 as a novel heterogeneous system for production of thionitrites and disulfides under mild conditions
Zolfigol, Mohammad Ali
, p. 9509 - 9511 (2001)
Neat chlorosulfonic acid reacts with silica gel to give silica sulfuric acid in which sulfuric acid is immobilized on the surface of silica gel via covalent bond. Thiols can be readily converted to their corresponding thionitrites with a combination of silica sulfuric acid, wet SiO2 and sodium nitrite in dichloromethane at room temperature. Disulfides result from the homolytic cleavage of the sulfur-nitrogen bond of the unstable thionitrites and subsequent coupling of the resultant thiyl radicals.