, Volume 16, Issue 4, pp 466-468

Kinetics and mechanism of ruthenium tetroxide catalysed oxidation of cyclic alcohols by bromate in a base

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Kinetic investigations on the RuO4-catalysed oxidation of cyclopentanol (Cypol) and cyclohexanol (Cyhol) in alkaline KBrO3 in the presence of Hg(OAc)2 which acts as a bromide ion scavenger have been made in the 30°–45°C range. The reaction exhibits zero order kinetics in OH and is first order with respect to BrO 3 , substrate and RuO4. The influence of Hg(OAc)2 and ionic strength is insignificant. A transient complex, formed between HRuO 5 (the active species of RuO4) and the cyclic alcohol, reacts with BrO 3 in a slow, rate determining step to give the products; the catalyst is regenerated.