Reactivity of Cyclanols Towards Quinaldinium Fluorochromate Oxidation

Abstract

The kinetics of oxidation of cyclanols, viz., cyclohexanol, cyclopentanol, cycloheptanol and cyclooctanol by quinaldinium fluorochromate has been studied in aqueous acid medium at 313 K (±0.1 K). The cyclanols were converted to the corresponding cyclic ketones. The order of reaction was found to be one with respect to oxidant and fractional with respect to the substrate and hydrogen ion concentrations. Increase in the percentage of acetic acid increases the rate of reaction. The reaction mixture shows the absence of any free radicals in the reaction, which has ruled out the possibility of a one-electron transfer during the addition of acrylonitrile. The reaction has been studied at four different temperatures and the activation parameters were calculated. From the observed kinetic results a suitable mechanism was proposed. The relative reactivity order was found to be cyclohexanol < cyclopentanol < cycloheptanol < cyclooctanol. This was explained on the basis of I-strain theory.

Kinetics and Mechanism of Oxidation of Some Substituted Phenol by Imidazolium Fluorochromate in Aqueous Acetic Acid

“…The chromium (VI) reagents containing heterocyclic base such as pyridinium chlorochromate 1 , pyridinium Flurochromate 2 , quinolinium Flurochromate 3 , quinolinium bromochromate 4 , imidazolium flurochromate 5 , quinaldinium Flurochromate, quinaldinium dichromate 6,7 etc. have been used for the study of oxidation of various organic substrates.…”