The hydrolysis of aryl 2-carboxyphenyl (salicyl) sulphates is subject to efficient nucleophilic catalysis by the neighbouring carboxylate group. The intermediate cyclic acyl sulphate can be trapped with hydroxylamine. The reaction of disalicyl sulphate is further catalysed by the second carboxy group, acting, rather inefficiently, as a general acid.
J. N. Drummond and A. J. Kirby, J. Chem. Soc., Perkin Trans. 2, 1986, 579 DOI: 10.1039/P29860000579
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