The Proton-transfer Reactions of the Univalent Anions of ortho-Hydroxy Azo Compounds in Dioxane-Water Media

Article abstract of DOI:10.1246/bcsj.53.101

The proton-transfer reactions of the univalent anions of 4-(2-pyridylazo)resorcinol (PAR) and 4-(2-hydroxy-5-ethylphenylazo)benzenesulfonic acid (HEB) with hydroxide ion in dioxane-water media, HA^- + OH^- <*> A^2- + H2O, were studied by means of temperature-jump method.The dependencies of the rate constants, k_t and k_r, on the solvent compositions were interpreted by a mechanism involving the breaking of an intramolecular hydrogen-bond.