The trimerization of phenyl isocyanate in the presence of triethylamine was accelerated under high pressure to give triphenyl isocyanurate almost quantitatively. The reaction in benzene was remarkably accelerated by compression. The effects of pressure, temperature, catalysts, and solvents were examined on the trimerization of phenyl isocyanate. Aryl and normal alkyl isocyanatestrimerized under high
of isocyanurates could be achieved from N-heterocyclic olefin mediated organocatalytic cyclotrimerization of a wide range of isocyanates under bulk conditions. Experimental details coupled with structural characterization of the key intermediates led to comprehensive mechanistic studies of cyclotrimerization.
Hexahydrotriazintrion-haltige Polyarylensulfide und Verfahren zu ihrer Herstellung
申请人:BAYER AG
公开号:EP0414054A1
公开(公告)日:1991-02-27
Die Erfindung betrifft neue Hexahydrotriazintrion-haltige, hochmolekulare Polyarylensulfide (PAS), vorzugsweise Polyphenylensulfide (PPS) und ein Verfahren zu ihrer Herstellung.