Abstract:The catalytic effect of VSi 2 on initial stages of the liquid-phase oxidation of cyclooctene by molecular oxygen was studied. The vanadium disilicide influences on the oxidation process in the presence of hydroperoxide. VSi 2 takes part in a radical formation stage by catalysis of hydroperoxide decomposition reaction. The catalyst was investigated before and after reaction using FTIR spectroscopy. From the data obtained, the kinetic model of the catalytic oxidation process was proposed and the equation for the reaction rate was derived. The equation has described all observed dependences of reaction rate on the concentration of reactants and content of catalyst.
in Wiley InterScience (www.interscience.wiley.com).The novel hydroperoxy sultams, 2,3-dihydro-3-hydroperoxy-2-aryl-4,5-diphenylisothiazole 1,1-dioxides, were synthesized by the oxidation of the 2-aryl-4,5-diphenyl substituted isothiazolium salts with H 2 O 2 . These hydroperoxy sultams were investigated as epoxidation agents in the epoxidation reaction of cis-cyclooctene catalyzed by MoB. 2-(2-Chlorophenyl)-2,3-dihydro-3-hydroperoxy-4,5-diphenylisothiazole 1,1-dioxide was found to have the highest epoxidation ability.
The kinetic regularities of the influence of low 1-octene concentrations on its epoxidation by tert-butyl hydroperoxide in the presence of molybdenum disilicide (MoSi 2 ) as a catalyst were investigated. The minimum in the dependence of the initial rate of hydroperoxide consumption on 1-octene concentration was observed. The kinetic scheme of epoxidation, which includes the competition between hydroperoxide and olefin for the catalytic active centers, was proposed. The equation for the reaction rate was derived according to the kinetic scheme. The kinetic parameters of epoxidation were calculated.
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