Kinetics And Mechanism Of Oxidation Of Some Alcohols And Carboxylic Acids Organic Compound By Cu(Ⅲ) Complex Ion

Kinetics and mechanism of oxidation of1-methoxy-2-propanol,1-ethoxy-2-propanol,1,2-Butanediol, mephenesin,5-sulfosalicylic acid and2-Aminoisobutyric acid by Cu（III） inalkaline medium were studied by spectrophotometry in this paper. The change of k_obswithdifferent [reductant],[TeO₄^2-],[OH^-] and ionic strength were studied, the determining-steprate constants at different temperatures and the activation parameters at298.2K wereevaluated.Through the experimentation, we find that the main existed form of DTC is thedeprotonated complex [Cu（H₄TeO₆）₂]-in alkaline medium, and we proposed that themechanism should be that the deprotonated complex Cu（H₃TeO₆） was the activation center.The reaction rate showed first order dependence in DTC, fractional order to1-methoxy-2-propanol,1-ethoxy-2-propanol,1,2-Butanediol, mephenesin and5-sulfosalicylicacid, and2-Aminoisobutyric acid was a multi-stage reaction. We also find that: Because thevarious functional group of the reductant, apparent reaction rate constant along with thechange of [OH^-] is different. Apparent reaction rate constant of1-methoxy-2-propanol,1-ethoxy-2-propanol,1,2-Butanediol, mephenesin,5-sulfosalicylic acid increased with anincrease in concentration of OH^-. But Apparent reaction rate constant of2-Aminoisobutyricacid decreased with an increase in concentration of OH^-. Based on the experimentation, wefound that the reaction rate changed with the number of activity group, such as:1-methoxy-2-propanol <1-ethoxy-2-propanol,1,2-Butanediol> mephenesin.The supposed mechanism could favorably explain the reaction results. The hypothesisthat the complex was existed as the deprotonated form was supported by our experimentalresults. Form the macroscopical experimentation phenomena, we will provide certaintheoretical foundation for the reaction route design of the organic synthesis and quantitativeanalysis of analytical chemistry.