Kinetics of Halogenation of Carboxy and Nitro Substituted Phenols by N_2,N_4,N_6-Trichloro-2,4,6-Triamino-1,3,5-Triazine in Non-Aqueous Acetic acid Systems

摘要

The kinetics of halogenation of o-and p-hydroxybenzoic acids,o-and p-nitrophenols has been studied by using trichloromelamine in 100% acetic acid with varying amounts of perchloric acid.The kinetic orders are first order in the halogenating agent,first order in o-and p-hydroxybenzoic acids,first order in p-nitrophenol and nearly first order in o-nitrophenol.The dependence on acid is first order in o-hydroxybenzoic acid,and fractional order in p-hydroxybenzoic acid,first order in p-nitrophenol and fractional order in o-nitrophenol.An attempt has been made to rationalise the observed results in the light of the Swain's treatment,k~i,k~ii,k~iii and k~iv have been evaluated and they are of right order of magnitude for these bimolecular reactions.