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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.