The kinetics and mechanism of the electrophilic substitution of heteroaromatic compounds. Part XXXIII. Hammett treatment for hydrogen exchange of monosubstituted benzenes in sulphuric acid under standard conditions

Abstract

Available kinetic data for the acid-catalysed hydrogen exchange of monosubstituted benzenes are extrapolated to give k₀ values relating to H₀= 0 and T= 100°. These k₀ values yield ρ–7·5 for the exchange reaction in aqueous sulphuric acid: rates in other acids are also discussed.