Abstract
The kinetics of cupric chloride-catalysed autoxidation of l-ascorbic acid has been studied in a number of organic solvents. The solvent effect can be expressed as a linear function of log k vs. reciprocal of dielectric constant (1/D) or Reicherdt's empirical parameter of solvent polarity (ET).8 The electrical conductance measurement shows that ionization of ascorbic acid to ascorbate ion is affected by the solvent polarity. The stability of ascorbate-copper complex seems to be lower in more polar solvents. The concentration of the complex combined with one or two oxygen molecules is higher at lower temperature. The mechanism of the autoxidation is discussed in comparison with that in aqueous solutions.2
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