In order to provide a strong basis for the path of organic synthesis, the kinetics of oxidation of 1,3-propanediamine (PDA) by diperiodatocuprater(Ⅲ) (DPC) in alkaline medium have been studied by spectrophotometry in a temperature range of 298.2～313.2 K. The reaction showed pseudo-first order with respect to DPC and 1 <n_(ap)<2 to PDA. It was found that the pseudo-first order rate constant k_(obs) increased with the increase of [OH~-], periodate had a retarding effect on the reaction rate. There is a weak negative salt effect. Based on the experimental results, a probable reaction mechanism of oxidation was proposed. The rate equation derived from the mechanism can explain all the experimental phenomena. The activation parameters along with the rate constants of the rate determined step were calculated and discussed, and thermodynamic quantities were also determined.
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