Abstract
Two methods of monitoring the chloride-catalysed oxidation of ascorbic acid by aqueous CuII have been developed that allow the reaction conditions to be varied more widely than previously and thereby permit a fuller elucidation of the behaviour and rate law for this system. It has been possible to study the reaction over a wide concentration range from 1.6 to 500 mM Cl– and 4 to 100 mM CuII. For the first time, it is shown that the ascorbic acid (H2asc)–CuII–chloride ion–CuI–dehydroascorbic acid (dha) system comes to equilibrium, under anaerobic conditions, with all species present and is driven towards products by chloride complexation of CuI. The results are consistent with the following reaction scheme (i = 0–2). The full rate law has been elucidated and values for [CHECK]various k1i, k–2i and k2i/k–1i have been determined.
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