M. Kubín scite author profile

SYNOPSISCyclotrimerization of phenyl isocyanate in the presence of various catalysts was studied. All reactions were carried out in 1,4-dioxane at 30-50°C. Reaction products were determined by reverse-phase liquid chromatography. 1,3,5-Triphenyl isocyanurate was formed and also traces of 1,3-diphenylurea and 1,3,5-triphenylbiuret were found. The catalytic activity decreased in the following series: quaternary ammonium salt > organic acid salt % tertiary amine. Apparent rate constants of cyclotrimerization were calculated and the overall reaction order is discussed.

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M. Kubín

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Cyclotrimerization of isocyanate groups. I. Catalyzed reactions of phenyl isocyanate

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