The pH-rate profile for the hydrolysis of salicyl sulfate reveals hydronium ion and intramolecular carboxyl group catalysis. In contrast the rate of hydrolysis of p-carboxyphenyl sulfate is accelerated only by hydronium ion. The acid-catalyzed hydrolysis of aromatic sulfates is viewed as an A1 mechanism on the basis of activation entropies and D2O solvent isotope and substituent effects. Intramolecular carboxyl group participation is discussed in terms of general acid or specific acid nucleophilic catalysis and compared to other examples involving similar behavior including salicyl phosphate.
All Science Journal Classification (ASJC) codes
- Colloid and Surface Chemistry