Calix[4]arene tetraethyl ester (1a) is hydrolysed by trifluoroacetic acid with the loss of one, and only one, ester group to form a monoacid triester; the process, which is inhibited by Na+ ion, is believed to involve specific hydronium ion complexation within the calixarene receptor.
V. Böhmer, W. Vogt, S. J. Harris, R. G. Leonard, E. M. Collins, M. Deasy, M. A. McKervey and M. Owens, J. Chem. Soc., Perkin Trans. 1, 1990, 431 DOI: 10.1039/P19900000431
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