Study of the kinetics and mechanism of oxidation of some esters by potassium permanganate in acid medium

Abstract

Abstract: In this study, the kinetics and mechanism of oxidation of some esters (ethyl ,butyl and methyl benzoate) by potassium permanganate in acid medium were established and this study showed that reaction rate law is depended to permanganate ion concentration only at high concentration of ester according to following equation: r = k [KMnO4] (k) rate constant of pseudo first order reaction where: k=k2[ester] The value of k is calculated from Aplot of (ln a/a-x) againet the time. Arrhenis plot (lnk) against (1/Tk°) allowed us to determine the value of (Ea,A,ΔH#,ΔG#,ΔS#). Addition the [H2SO4] increase the rate constant increase. this results are in accordance with the mechanism proposed of oxidation reaction. الخلاصة:

Keywords

• oxidation
• esters
• potassium permanganate
• acid medium