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The acceleration, by a factor of 2500, of the hydrolysis of endo-5-[4'(5')imidazolyl]bicyclo[2.2.1]hept-endo- 2-yl trans-cinnamate by 0.5 M sodium benzoate in 42 mol% dioxane in water can be explained without resort to operation of a "charge-relay" mechanism similar to that often postulated to account for the enzymatic activity of serine proteases. The degree of ionization of 4-methylimidazole and of sodium benzoate in 42 mol% dioxane in water at 60 degrees C have been measured by NMR spectroscopy.

proceedings of the national academy of sciences of the united states of america

Benzoate catalysis in the hydrolysis of endo -5-[4′(5′)imidazolyl]-bicyclo[2.2.1]hept- endo - 2-yl trans -cinnamate: Implications for the charge-transfer mechanism of catalysis by serine proteases