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    STUDIA CHEMIA - Issue no. 1 / 2003  
         
  Article:   KINETIC STUDY ON HYDROLYSIS REACTION OF DIOXIMES.

Authors:  G. SZABÓ, JANOS ZSAKO, IOAN BÂLDEA, CS. BOLLA. 		 
       
         
  Abstract:  The hydrolysis of 1,2,3-cyclohexanetrione-1,3-dioxime (CTD) and 1,2,3-cyclohexanetrione-2-imine-1,3-dioxime (CTDI) was studied polarogaphically at different concentrations of perchloric acid. It was followed the time course of diffusion current intensity of the polarographic wave. First order rate constants were derived and the influence of perchloric acid concentration was studied. A mechanism of hydrolysis reaction consisting of a protolytic pre equilibrium, followed by a slow competitive water addition onto both the protonated and non protonated forms of the dioxime has been suggested. The final step is presumed to be a fast elimination of hydroxylamine. On the basis of this mechanism it was derived a relationship among the rate constants, acidity constant and the hydrogen ion concentration. Acidity constants were calculated for the protonated oximes.  
         
     
         
         
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