South African Journal of Chemistry
On-line version ISSN 1996-840X
Print version ISSN 0379-4350
HASSAN, Mohammed; AL-HAKIMI, Ahmed N. and ALAHMADI, Mohammed D.. Kinetics of oxidation of aliphatic alcohols by potassium dichromate in aqueous and micellar media. S.Afr.j.chem. (Online) [online]. 2011, vol.64, pp.237-240. ISSN 1996-840X.
The kinetics of oxidation of four aliphatic alcohols in acidic aqueous and micellar media were investigated. The reaction was found to be first-order with respect to both alcohol and oxidant. Pseudo-first-order kinetics were found to be perfectly applicable with ethanol, 1-propanol and 2-propanol while deviation was observed at intermediate stages of the reaction with methanol. The pseudo-first-order rate constants were found to be independent of concentration of the oxidant. The presence of TX-100 enhanced the rate of the reaction for all alcohols. Negative salt effects were observed with addition of KCl to the reaction mixture. A suitable mechanism for the reaction was suggested which agrees with the experimental findings.
Keywords : Oxidation; dichromate; alcohol; pseudo-first-order; micellar effect.