The basicity constants KBH+ of seven substituted phenylureas have been evaluated in sulphuric acid at 25°. The protonation equilibria follow the HA acidity function and –pKBH+ of 12 substituted phenylureas correlate well with Hammett σ. The site of protonation is discussed.
C. J. Giffney (née Hyland) and C. J. O'Connor, J. Chem. Soc., Perkin Trans. 2, 1975, 1206 DOI: 10.1039/P29750001206
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