Ionisation constants of 3-phenyl- and 6-methyl-3-phenyl-2H-thiopyran 1,1-dioxides have been determined spectrophotometrically in water and in methanol. The data are consistent with the corresponding anions being particularly stable. The results are compared with those for other sulphonyl-substituted carbon acids.
G. Gaviraghi and G. Pagani, J. Chem. Soc., Perkin Trans. 2, 1973, 50 DOI: 10.1039/P29730000050
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