60253-50-1Relevant academic research and scientific papers
Aluminium-catalysed isocyanate trimerization, enhanced by exploiting a dynamic coordination sphere
Bahili, Mohammed A.,Stokes, Emily C.,Amesbury, Robert C.,Ould, Darren M. C.,Christo, Bashar,Horne, Rhian J.,Kariuki, Benson M.,Stewart, Jack A.,Taylor, Rebekah L.,Williams, P. Andrew,Jones, Matthew D.,Harris, Kenneth D. M.,Ward, Benjamin D.
supporting information, p. 7679 - 7682 (2019/07/08)
Main-group metals are inherently labile, hindering their use in catalysis. We exploit this lability in the synthesis of isocyanurates. For the first time we report a highly active catalyst that trimerizes alkyl, allyl and aryl isocyanates, and di-isocyanates, with low catalyst loadings under mild conditions, using a hemi-labile aluminium-pyridyl-bis(iminophenolate) complex.
Potassium complexes containing bidentate pyrrole ligands: Synthesis, structures, and catalytic activity for the cyclotrimerization of isocyanates
Guo, Zhiqiang,Xu, Yuan,Wu, Xiaoqin,Wei, Xuehong,Xi, Chanjuan
supporting information, p. 8116 - 8121 (2019/06/19)
Bidentate pyrrolyl ligands, 2-(t-butyliminomethyl)pyrrole and 2-(t-butylaminomethyl)pyrrole, reacted with KH to give complexes [C4H3N(2-CHNtBu)K(THF)]n (1) and [C4H3N(2-CH2NHsup
Isocyanurate Formation During Oxazolidinone Synthesis from Epoxides and Isocyanates Catalysed by a Chromium(Salphen) Complex
Wu, Xiao,Mason, Jess,North, Michael
, p. 12937 - 12943 (2017/09/25)
Chromium(salphen) complex 10 is found to be a catalyst for the preparation of oxazolidinones from epoxides and isocyanates. Using the optimal reaction conditions (1.5 mol % of chromium(salphen) complex 10 at 80 °C in toluene for 4 hours), six epoxides wer
Generation of low-valent alkoxy niobium from Nb(OEt)5 and Grignard reagents and their use as catalysts in the cyclotrimerization of isocyanates
Ozaki, Makoto,Obora, Yasushi,Tada, Yusuke,Ishii, Yasutaka
, p. 109 - 113 (2013/10/01)
A new highly active low-valent alkoxyniobium species has been developed following the reaction of Nb(OEt)5 with Grignard reagent such as i-PrMgCl or EtMgCl, with the material behaving as an efficient catalyst for cyclotrimerization reaction of isocyanates. In this reagent system, the existence of a lowvalent niobium species was confirmed by the formation of the niobiumealkyne complex prepared from the Nb(OEt)5/Grignard reagent system and an alkyne. Furthermore, the hydrolysis and diallylation reactions of the niobiumealkyne complex provided further confirmation of its existence, with corresponding (Z)-alkene and diallylated products being isolated in good yields.
Polymer-supported, carbon dioxide-protected n-heterocyclic carbenes: Synthesis and application in organo- and organometallic catalysis
Pawar, Gajanan Manohar,Buchmeiser, Michael R.
scheme or table, p. 917 - 928 (2010/06/15)
The synthesis of a resin-supported, carbon dioxide-protected N-heterocyclic carbene (NHC) and its use in organocatalysis and organometallic catalysis are described. The resin-bound carbon dioxide-protected NHC-based catalyst was prepared via ring-opening
CO2 and SnII adducts of N-heterocyclic carbenes as delayed-action catalysts for polyurethane synthesis
Bantu, Bhasker,Pawar, Gajanan Manohar,Decker, Ulrich,Wurst, Klaus,Schmidt, Axel M.,Buchmeiser, Michael R.
experimental part, p. 3103 - 3109 (2009/11/30)
A series of CO2-protected pyrimidin-2-ylidenes as well as 1,3-dimesitylimidazol-2-ylidene and dimesitylimidazolin-2-ylidene complexes of SnII have been prepared. Selected single-crystal X-ray structures are reported. The new compound
The aza Curtius rearrangement
Yagupolskii, Lev M.,Shelyazhenko, Svetlana V.,Maletina, Irina I.,Petrik, Vitalij N.,Rusanov, Eduard B.,Chernega, Alexander N.
, p. 1225 - 1233 (2007/10/03)
On interaction of N-(trifluoromethylsulfonyl)carboximidoyl chlorides (analogs of acyl chlorides in which the carbonyl oxygen atom is substituted by the more strongly electron-withdrawing =NSO2CF3 group) with sodium azide in glyme or acetonitrile at -5 to +10 °C, dinitrogen is eliminated quantitatively and carbodiimides RN=C=NSO2CF3 are formed in high yield. In other words, an aza Curtius rearrangement occurs. The carbodiimides react with water, alcohols, and secondary amines to give corresponding ureas, isoureas, and guanidine derivatives. Imidoyl chlorides with substituents other than SO2RF do not enter into the aza Curtius reaction.
