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

S̆pírková Milena | Zendy; Kubín Miroslav | Zendy; S̆pac̆ek Pavel | Zendy; Krakovský Ivan | Zendy; Dus̆ek Karel | Zendy

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

Author(s) -

S̆pírková Milena,

Kubín Miroslav,

S̆pac̆ek Pavel,

Krakovský Ivan,

Dus̆ek Karel

Publication year - 1994

Publication title -

journal of applied polymer science

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.575

H-Index - 166

eISSN - 1097-4628

pISSN - 0021-8995

DOI - 10.1002/app.1994.070520708

Subject(s) - isocyanate , catalysis , salt (chemistry) , chemistry , amine gas treating , polymer chemistry , phenyl isocyanate , ammonium , tertiary amine , organic chemistry , medicinal chemistry , polyurethane

Cyclotrimerization 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. © 1994 John Wiley & Sons, Inc.

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