Oxidation of Some Organic Sulfides by Benzyltrimethylammonium Chlorobromate: A Kinetic and Mechanistic Approach

The oxidation of 34 sulfides by benzyltrimethylammonium chlorobromate (BTMACB) resulted in formation of the corresponding sulfoxides. The reaction is first order with respect to both BTMACB and the sulfide. The solvent composition effect indicated that the rate of reaction increases with increase in...

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Published inProgress in reaction kinetics and mechanism Vol. 37; no. 3; pp. 263 - 276
Main Authors Tiwari, V., Meena, A., Daiya, A., Prasadrao, Posani Tsrk, Sharma, Vinita
Format Journal Article
LanguageEnglish
Published Fayetteville Maximum Academic Press 01.01.2012
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ISSN1468-6783
1471-406X
DOI10.3184/146867812X1330253472635

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Abstract The oxidation of 34 sulfides by benzyltrimethylammonium chlorobromate (BTMACB) resulted in formation of the corresponding sulfoxides. The reaction is first order with respect to both BTMACB and the sulfide. The solvent composition effect indicated that the rate of reaction increases with increase in the polarity of the medium. The reaction failed to induce the polymerization of acrylonitrile. There is no effect of added benzyltrimethylammonium chloride or potassium bromide. Chlorobromate ion is postulated as the reactive oxidizing species. The rates of oxidation of meta- and para-substituted phenyl methyl sulfides were correlated with Charton's LDR equation. The rates of oxidation of the ortho-compounds showed excellent correlation with the LDRS equation. The oxidation of meta-compounds exhibited a greater dependence on the field effect. The reaction is subject to steric inhibition when an ortho-substituent is present. The oxidation of alkyl phenyl sulfides is subject to both polar and steric effects of the alkyl groups. The polar reaction constants are negative, indicating an electron-deficient sulfur centre in the rate-determining step. A mechanism has been proposed involving formation of a halogenosulfonium cation in the slow step.
AbstractList The oxidation of 34 sulfides by benzyltrimethylammonium chlorobromate (BTMACB) resulted in formation of the corresponding sulfoxides. The reaction is first order with respect to both BTMACB and the sulfide. The solvent composition effect indicated that the rate of reaction increases with increase in the polarity of the medium. The reaction failed to induce the polymerization of acrylonitrile. There is no effect of added benzyltrimethylammonium chloride or potassium bromide. Chlorobromate ion is postulated as the reactive oxidizing species. The rates of oxidation of meta - and para-substituted phenyl methyl sulfides were correlated with Charton's LDR equation. The rates of oxidation of the ortho-compounds showed excellent correlation with the LDRS equation. The oxidation of meta-compounds exhibited a greater dependence on the field effect. The reaction is subject to steric inhibition when an ortho-substituent is present. The oxidation of alkyl phenyl sulfides is subject to both polar and steric effects of the alkyl groups. The polar reaction constants are negative, indicating an electrondeficient sulfur centre in the rate-determining step. A mechanism has been proposed involving formation of a halogenosulfonium cation in the slow step.
The oxidation of 34 sulfides by benzyltrimethylammonium chlorobromate (BTMACB) resulted in formation of the corresponding sulfoxides. The reaction is first order with respect to both BTMACB and the sulfide. The solvent composition effect indicated that the rate of reaction increases with increase in the polarity of the medium. The reaction failed to induce the polymerization of acrylonitrile. There is no effect of added benzyltrimethylammonium chloride or potassium bromide. Chlorobromate ion is postulated as the reactive oxidizing species. The rates of oxidation of meta- and para-substituted phenyl methyl sulfides were correlated with Charton's LDR equation. The rates of oxidation of the ortho-compounds showed excellent correlation with the LDRS equation. The oxidation of meta-compounds exhibited a greater dependence on the field effect. The reaction is subject to steric inhibition when an ortho-substituent is present. The oxidation of alkyl phenyl sulfides is subject to both polar and steric effects of the alkyl groups. The polar reaction constants are negative, indicating an electron-deficient sulfur centre in the rate-determining step. A mechanism has been proposed involving formation of a halogenosulfonium cation in the slow step.
Author Meena, A.
Tiwari, V.
Prasadrao, Posani Tsrk
Sharma, Vinita
Daiya, A.
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Snippet The oxidation of 34 sulfides by benzyltrimethylammonium chlorobromate (BTMACB) resulted in formation of the corresponding sulfoxides. The reaction is first...
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SubjectTerms Chlorides
Title Oxidation of Some Organic Sulfides by Benzyltrimethylammonium Chlorobromate: A Kinetic and Mechanistic Approach
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