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.
通过对相应的1-芳基咪唑啉-2,4-二酮进行控制碱水解,制备了三种(1-芳基脲基)乙酸。它们及(3-苯基脲基)乙酸的pKa值在25.0°C的0.01 M溶液中通过滴定电位法测定。从酸度常数计算出了四个新的σI常数。