RESEARCH ARTICLE

 

Kinetics of oxidation of aliphatic alcohols by potassium dichromate in aqueous and micellar media

 

 

Mohammed Hassan^{I, *}; Ahmed N. Al-Hakimi^I; Mohammed D. Alahmadi^II

^IDepartment of Chemistry, Faculty of Science, Ibb University, Ibb 7027, Yemen
^IIDepartment of Chemistry, Faculty of Education, Aden University, Aden, Yemen

 

 

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ABSTRACT

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

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Received 22 October 2010
Revised 10 October 2011
Accepted 2 November 2011

 

 

* To whom correspondence should be addressed. E-mail: abuusef2002@gmail.com