The disappearance of 3-and 1-acetoxynortricyclanes (1 and 2) in aqueous perchloric acid was followed by capillary gas chromatography at different temperatures and acid concentrations. According to the activation parameters, solvent deuterium isotope effects and parameters of excess acidity equations, the A AC 2 ester hydrolysis with two water molecules in the transition state is dominant at the lower acid concentrations studied (1-5.5 M HClO 4 ) and the Ad E 2 hydration of the cyclopropane ring is dominant at higher acid concentrations (6-8 M HClO 4 ) at 298 K. 3-Nortricyclanol (3) is formed via hydrolysis from 1, whose hydration products were not analyzed. 2-Norbornanone (4) is formed via both hydrolysis and hydration from 2.

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