Abstract
A kinetic study of the reactions of 4-nitrophenyl 5-nitrosalicylate in aqueous Tris buffer at 25°C has revealed three kinetically significant reactions: Tris aminolysis of the un-ionized substrate, Tris aminolysis of the ionized substrate, and spontaneous hydrolysis of the ionized substrate. Solvent isotope effects have been measured for all three reactions. Mechanisms are discussed, and the conclusion is reached that intramolecular catalysis is operating in only the spontaneous hydrolysis.
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