WebNational Center for Biotechnology Information Webcyclotrimerization of phenyl isocyanate to triphenyl isocyanurate. 1 Introduction Isocyanurates are known as highly thermally and mechanically stable frameworks. By …
(PDF) Isocyanurate formation during rigid polyurethane
WebThe unusually strong Lewis basicity of the P atom and the ability to form transannular P N interactions of various strengths account for the high catalytic activity of [P(MeNCH 2 CH 2) 3 N] in the title reaction, a key step of which is shown on the right. Thus a 97% yield of triphenyl isocyanurate (Ar = C 6 H 5) was obtained in 3 min, and a 99% yield of tri-para … WebReaction of trimethylsilyl sulphide with phenyl isocyanate gives a 1 : 1 insertion product, but subsequent insertion of phenyl isocyanate takes place readily in the case of trialkylstannyl sulphide, to produce triphenyl isocyanurate. When chloral is used as a reactant for trialkyltin sulphides, substitution of all nan fleming centre
Degradation of a polyisocyanurate obtained by ... - ScienceDirect
WebJan 1, 1981 · The replacement of the non-polar ditoluylmethane by diglyme and the polar nitrobenzene resulted in the selective cyclotrimerization of phenyl isocyanate and a quantitative yield of the triphenyl isocyanurate in 2-3 hr an 120-130. A temperature reduction to below 100 resulted in a simultaneous tri- and di- merization. WebJun 17, 2024 · The reaction of 3 with phenyl isocyanate (PhNCO; 500 equiv.) completely solidified within 1 h at 50 °C or 18 h at 25 °C , corresponding to essentially quantitative conversion of the isocyanate to N,N′,N′′-triphenyl isocyanurate. NMR and mass spectra indicate that the crude product mixture is pure (only trimer is detected), and the bulk ... WebVolume 32, Issue 6. Cover Picture (Angew. Chem. Int. Ed. Engl. 6/1993) The cover picture shows schematically the β-spiral structure of poly (GVGVP) (left) and the polypeptides designed from it, containing Glu residues (red) and hydrophobic Phe residues (white and pink). The optimal arrangement of the Phe residues about the Glu residues for the ... meghan trainor roblox id