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).
Coleman,Blout
, p. 2405,2407, 2408 (1968)
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Vints,V.V. et al.
, (1973)
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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.
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.
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.
Fabrication of La (III) supported on CoFe2O4 MNPs: a novel and efficient heterogeneous catalyst for selective oxidation of sulfides and synthesis of symmetrical disulfides
Molaei, Somayeh,Ghadermazi, Mohammad,Moeini, Nazanin
, p. 771 - 793 (2021/12/02)
Abstract: This paper reports the fabrication of La supported on CoFe2O4 nanoparticles through tryptophan (Trp) post-functionalization modification of CoFe2O4 which can be used as an efficient recyclable nanocata
Synthesis and Characterization of Magnetic Functionalized Ni and Cu Nano Catalysts and Their Application in Oxidation, Oxidative Coupling and Various Multi-Component Reactions
Hajjami, Maryam,Sheikhaei, Shiva,Gholamian, Fatemeh,Yousofvand, Zakieh
, p. 2420 - 2435 (2021/01/04)
Abstract: Two magnetic nano catalysts of nickel and copper, Fe3O4@SiO2@DOP-BenPyr-M(II), (M=Ni and Cu) have been synthesized. These catalysts were applied as recoverable, efficient and new heterogeneous catalysts for the high yielding and room temperature one-pot procedure of selective oxidation of sulfides to sulfoxides and oxidative coupling of thiols to disulfides. In addition, the catalytic activity of Fe3O4@SiO2@DOP-BenPyr-Ni(II) was investigated as heterogeneous nanocatalyst for synthesis of 2,3-dihydroquinazolin-4(1H)-ones, 5-substituted 1H-tetrazoles and polyhydroquinolines. The synthesized catalysts were characterized by FT-IR, TGA, XRD, VSM, EDX, ICP and SEM techniques. These catalysts were recovered by an external magnet and reused several times without significant loss of catalytic efficiency. Graphic Abstract: [Figure not available: see fulltext.]