The influence of some 5-substituents on the acid strength and ΔH0 and ΔS0 of dissociation of barbituric acid in aqueous solutions has been investigated. The acid strength depends much more strongly on the substituent than is the case with carboxylic acids.
H. Koffer, J. Chem. Soc., Perkin Trans. 2, 1974, 1428 DOI: 10.1039/P29740001428
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