Kinetics of hydrolysis of some model bifunctional reactive dyes

Abstract

The hydrolysis in alkaline solution of some model bifunctional reactive dyes has been studied using 1H-NMR. The kinetics of the hydrolysis of the monochlorotriazine group and the vinylsulfone group were studied by the chloride ion-selective electrode method and by 1H-NMR respectively. HMO theory was used to calculate the reactive indices on the two reactive sites and a very good relationship was found between In k and super delocalizability, S N r: For the monochlorotriazine group, T ln k 1( × 10 −3) = 1.397S r1 7 −3.957 and For the vinylsulfone group. T ln k 2( × 10 −3) = 0.777S r2 N −3.287