42474-44-2Relevant academic research and scientific papers
Solution reactivity of thiyl radicals with molecular oxygen: Unsensitized photooxidation of dimethyldisulfide
Banchereau, Evelyne,Lacombe, Sylvie,Ollivier, Jean
, p. 8197 - 8200 (2007/10/02)
Irradiation of dimethyldisulfide in a protic solvent in the presence of molecular oxygen leads to the formation of sulfonic and sulfuric acids as major products. The addition of molecular oxygen on the thiyl radical formed by S-S bond cleavage is postulated.
Analysis of Radicals from Flames by Scavenging with Dimethyl Disulfide
Hausmann, M.,Homann, K. H.
, p. 1308 - 1312 (2007/10/02)
Larger hydrocarbon radicals in flames, which are difficult to detect by optical methods, can be analyzed quantitatively by radical scavenging with dimethyl disulfide in the condensed phase. - Gas samples taken from a sooting ethyne/oxygen flame by a nozzle beam were frozen at liquid-N2-temperature on the inner surface of a hollow sphere simultaneously with the radical scavenger dimethyl disulfide.The latter was admitted in large excess as a gas and was condensed uniformly on the inner wall of the sphere.The mixture of condensable stable flame products and scavenging products in the excess CH3SSCH3 was separated and identified by GC/MS. - Larger hydrocarbons (CxHy, x >= 6) condensed quantitatively.H, CH3, C4H3 and the phenyl radical were scavenged as mono(methylthio) compounds; C2 and the carbenes CH2, C3H2, C5H2 yielded bis(methylthio) compounds; other bis(methylthio) compounds observed were C2nH2(SCH3)2 with n = 1, 2, 3 and 4.CH, C3H and C2H3 were identified by the respective tris(methylthio) compounds.Any consecutive reactions of radicals with stable flame products and their recombinations in the cold trap were supressed by their scavenging reaction.
SCAVENGING OF RADICALS FROM THE GAS PHASE BY FREEZING WITH DIMETHYL DISULFIDE: 2. RADICALS FROM DISCHARGES AND A FLAME OF ACETYLENE.
Kubitza,Schottler,Homann
, p. 695 - 700 (2007/10/02)
The method of detecting radicals from low-pressure gas-phase systems by scavenging with dimethyl disulfide (DMD) has been applied to microwave discharges in C//2H//2/He mixtures and to a C//2H//2/O//2 flame. It was accomplished by condensing a supersonic nozzle beam from the reaction system together with a beam of DMD on a liquid-N//2 cooled surface. The scavenging products were measured by GC/MS after warming-up. Radicals measured in the discharge were C//2H, C//4H, C//6H, C//3H//2, C//2 besides H atoms. Preliminary measurements on the flame showed that C//6H//5 (phenyl), CH//2, C//3H//2, besides H and O atoms were prominent radicals at the end of the oxidation zone. The concentration of phenyl is of the same order as that of e. g. naphthalene.
SCAVENGING OF RADICALS FROM THE GAS PHASE BY FREEZING WITH DIMETHYL DISULFIDE: 1. TEST OF THE METHOD FOR LIGHT RADICALS.
Schottler,Homann
, p. 688 - 694 (2007/10/02)
H and O atoms and methyl radicals produced in microwave discharges of H//2/He, O//2/He and CH//4/He mixtures, respectively, were scavenged by supersonic nozzle probing with subsequent freezing and reaction with dimethyl disulfide on a liquid nitrogen cooled wall. The main reaction products for the three kinds of radicals were CH//3SH, CH//3S(O)SCH//3 and CH//3SCH//3, respectively. The scavenging efficiencies for the different radicals were determined and measured as a function of the gas phase radical concentration, the flow of scavenger molecules, the pressure in the vacuum chamber, and the conditions of the discharge and the flow through the sampling nozzle. It is concluded that this method is suitable for light radicals with reservations in the case of H atoms and can probably be used with still better success for heavier radicals.
Reaction of methanethiol with species produced in a microwave discharge through water vapor
Chang, C. H.,Goodfriend, P. L.,Bentley, M. D.,Anderegg, R. J.
, p. 1617 - 1619 (2007/10/02)
The products of reaction of methanethiol with species produced by passage of water vapor through a microwave discharge were studied.Mass spectrometric analysis demonstrated the presence of SO2, CH3SSCH3, CH3SSSCH3, CH3SSSSCH3, CH3SSCH2SCH3, CH3SCH2SCH3, and S8.These products are consistent with a mechanism involving abstraction of hydrogen from CH3SH by OH and other radicals as the important primary process.
ZUR SYNTHESE VON ALKYLTHIO-, CYCLOALKYLTHIO- UND CYCLOALKYLDISULFIDEN DURCH OXIDATION VON MERCAPTOTHIOETHERN, BIS-MERCAPTO-THIOETHERN UND BIS-MERCAPTOALKANEN MIT JOD UND TRIETHYLAMIN
Weissflog, Eckhard
, p. 27 - 32 (2007/10/02)
The treatment of mercaptothioethers CH3(SCH2)nSH, n = 1,2 1,2 with equivalent amounts of iodine and triethyl amine leads to the formation of 2.4.5.7-tetrathiaoctane 3 and 2.4.6.7.9.11-hexathiadodecane 4.Oxidation of ethanedithiol-1.2 5 leads to polyethylene disulfide 6, 1.2.5.6-tetrathiacyclooctane 7 and 1.2.5.6.9.10.13.14-octathiacyclohexadecane 8, whereas bis-(mercaptomethyl)-sulfide 9 is converted to polymeric sulfides or disulfides and 1.2.4.6-tetrathiacycloheptane 10.
