Simple ureas derived from diisocyanates and their liquid chromatography on a 5-cm column

Aliphatic and aromatic diisocyanates were converted to ureas by a chromophoric derivatizing reagent. The ureas were isolated in the pure form characterized by various methods including nuclear magnetic resonance and mass spectrometry. A chromatographic analytical separation of the urea test solutions was established. The method was used to demonstrate the derivatization of the isocyanates and direct determination of the produced ureas from the reaction mixture.