Hydrolysis of phenyl N-(o-carboxyphenyl)carbamate is rapid and involves direct nucleophilic displacement by the CO2–group with the formation of an isatoic anhydride intermediate.
L. N. Frost and A. F. Hegarty, J. Chem. Soc., Chem. Commun., 1973, 82 DOI: 10.1039/C39730000082
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