33870-02-9Relevant articles and documents
KINETICS OF THE CYCLOTRIMERIZATION AND COCYCLOTRIMERIZATION OF ISOCYANATES CATALYZED WITH ALKALI METALS ALKOXIDES
Bukac, Zbynek,Nechaiev, Alexandr,Sebenda, Jan
, p. 2219 - 2226 (2007/10/02)
For the rate of cyclotrimerization vt of phenyl isocyanate (I) in tetrahydrofuran catalyzed with Li, Na or K tert-butoxides (A) at 30 deg C, the coefficients k, a, b of the empirical relation vt = kab
Method for producing cyclic trimers of organic isocyanates
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, (2008/06/13)
The invention relates to a method for producing cyclic trimers of organic isocyanates from isocyanates employing as catalyst sodium dihydro-bis-/alkoxyethoxy/aluminates of the general formula where R is C1 -C4 alkyl group. The catalysts are soluble in the reaction solvent and consequently, the procedure is a desirable one because of its safety and easy handling and metering and the control of the strongly isothermic reaction is possible. Common cheap and relatively non-poisonous solvents which can be freed of water by distillation may be used as the reaction medium. The catalysts are used in the amount of 0.0005 to 0.05 moles per one mole of isocyanate.