Butanolysis of B-tris(phenylethynyl)borazine in 1-butanol-dioxane mixed solvent

Article abstract of DOI:10.1021/ic50065a008

The alcoholysis of B-tris(phenylethynyl)borazine was investigated in 1-butanol-dioxane mixed solvent in the presence of triethylamine as catalyst. The reaction was followed spectrophotometrically and was found to be first order with respect to the sample as well as the amine concentration. Distinct features were found in the activation parameters, the Arrhenius activation energy being 4.79 kcal/mol and the activation entropy being -45.3 eu. Solvent isotope effect and solvent composition effect on k_obsd were also examined. Analyses of these data led to the conclusion that butanol hydrogen-bonded to an amine or to a triethylammonium butylate ion pair attacks the borazine ring in the rate-determining step.