5.
Rhodium(III) Catalyzed Oxidation of Cyclopentanone and Cyclohexanone
by Acidic Sodium Periodate: A Kinetic Study
Sheila
Srivastava* Shalini Singh, Sangeeta Srivastava, Parul & Pushpanjali
Singh.
Chemical
Laboratories,
Feroze Gandhi College, RaeBareli-229001, U.P., India.
E-mail:
she_ila72@yahoo.com
/
shalinisingh_chem@yahoo.co.in
Abstract
The kinetics of
rhodium(III) catalyzed oxidation of cyclopentanone and
cyclohexanone by sodium periodate in acidic medium have been
studied in the temperature range 30-450C . The reaction was
carried out in the presence of mercuric acetate as a scavenger.
The rate showed first-order kinetics with respect to the oxidant
i.e. sodium periodate and catalyst Rh(III) chloride for both
cyclopentanone and cyclohexanone. Both the substrate
cyclopentanone and cyclohexanone showed first order kinetics at
its lower concentration tending to zero order at higher
concentration. Insignificant influence of mercuric acetate and
ionic strength of the medium were observed while the reaction
showed no effect of [Cl-] and [H+] on the reaction rate for both
cyclopentanone and cyclohexanone.
Various activation
parameters have been calculated. A suitable mechanism in
agreement with observed kinetics has been proposed.
Keywords :-
kinetics, Rh(III), oxidation, cyclic-ketones, acidic
sodium- periodate
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