Kinetics of Iodination of Di-substituted Phenols by Iodine Monochloride in Aqueous Methanol

Abstract

The kinetics of iodination of di-substituted phenols such as 2,4-dinitro,

2,4-dichloro and 2,4-dibromophenolsby iodine monochloride in

(70 : 30% v/v) methanol and water mixture medium shows that the first

order dependence each in (ICI) and (substrate), and is overall second order.

On the basis of kinetic results, a suitable mechanism has been proposed.

Activation energy and other thermodynamic parameters were calculated.

The relative order of reactivities of the di-substituted phenols studied are

2,4-dibromophenol > 2,4-dichlorophenol > 2,4-dinitrophenol.