Collect. Czech. Chem. Commun. 1993, 58, 2663-2672

A Discussion of the Cyclotrimerization Mechanism of Isocyanates

Ivan Krakovský and Milena Špírková

Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, 162 06 Prague 6, Czech Republic


A reaction scheme of cyclotrimerization of phenyl isocyanate in the presence of potassium 2-ethylhexanoate as a catalyst was proposed. From kinetic equations, the reaction orders and concentrations of the intermediates were calculated using quasistationary approximation. Concentrations of biuret and urea (product of reaction intermediates with water) can provide information on the reaction mechanism.