Collect. Czech. Chem. Commun. 2004, 69, 2276-2280

σI Values for Arylureido Groups

Iva B. Blagoeva*, Asen H. Koedjikov, Ivan G. Pojarlieff and Stefan P. Stanchev

Institute of Organic Chemistry, Bulgarian Academy of Sciences, ul. Acad. G. Bonchev block 9, Sofia 1113, Bulgaria


Three (1-arylureido)acetic acids were prepared by means of controlled alkaline hydrolysis of the respective 1-arylimidazolidin-2,4-diones. Their pKa values and that of (3-phenylureido)- acetic acid were determined potentiometrically by titration in 0.01 M solutions at 25.0 °C. Four new σI constants were calculated from the acidity constants.

Keywords: Hydantoin; N-Arylhydantoic acids; Acidity constants; Sigma values; N-Arylureido groups; Hammett equation; LFER.

References: 13 live references.