Abstract
The kinetics and mechanism of oxidation of benzaldehyde by quinoxalinium dichromate has been studied in the presence of perchloric acid in 70 % acetic acid - water medium. The reaction follows first order with respect to benzaldehyde, quinoxalinium dichromate and fractional order with respect to perchloric acid. There is no effect on the reaction rate with increase in ionic strength of the medium by adding sodium perchlorate. The rate of reaction increases with increase in the percentage of acetic acid. The reaction does not induce the polymerization with acrylonitrile. The rate of reaction decreases with increase in the concentration of manganoussulphate. The thermodynamic and activation parameters have been calculated and a probable mechanism has been proposed.
Highlights
Quinoxalinium dichromate (C8H6N2H2)Cr2O7 (QxDC) has been used in the oxidation of many organic substrates
We report the mechanistic aspects of the oxidation of benzaldehydes by quinoxalinium dichromate
The linear plot of log k against log [substrate] with a slope (1.07) of unity clearly indicates that the reaction has unit order dependence on the concentration of the substrate
Summary
Quinoxalinium dichromate (C8H6N2H2)Cr2O7 (QxDC) has been used in the oxidation of many organic substrates. Quinoxalinium dichromate Kinetics of oxidation of some organic substrates[2-5] by quinoxalinium dichromate has been reported. The kinetics and mechanism of oxidation of oxidation of benzaldehyde by various oxidants have been reported[6-19]. We report the mechanistic aspects of the oxidation of benzaldehydes by quinoxalinium dichromate.
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