Kinetics of oxidation of Thiomalic acid by Quinaldinium fluorochromate

The kinetics of oxidation of thiomalic acid by quinaldinium fluorochromate(QnFC) has been studied in non - aqueous medium. The oxidation kinetics was followed photoelectric colorimetrically in the temperature range of 30°C–60°C. The reaction shows unit order dependence each with respect to substrate and oxidant. The reaction is catalyzed by hydrogen ions. The hydrogen ion dependence takes in the form kobs = a + b [H+]. The reaction rate decreases with increasing the concentration of Mn2+ ions. The reaction does not induce the polymerization of acrylonitrile. A plausible mechanism has been proposed in the formation of a thio ester and its decomposition which occurs in the slow step.

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