113056-95-4Relevant academic research and scientific papers
Haloamidation of alkynes and related reactions using zirconacycles and isocyanates
Li, Yanzhong,Matsumura, Hiroshi,Yamanaka, Masamichi,Takahashi, Tamotsu
, p. 1393 - 1400 (2004)
Zirconacyclopentenes reacted with isocyanates to give aza- or oxazirconacycles which were conveniently coverted into the corresponding haloamidation products of alkynes after halogenation. 1,4-Bistrimethylsilyl substituted zirconacyclopentadiene afforded a low yield of iodoamidation product, whereas zirconium-alkyne complexes stabilized with phosphine gave the iodoamidation products in moderate yields. On the other hand, zirconacyclopentanes reacted with isocyanates to give trimerization products of isocyanate, isocyanurates.
Highly efficient cyclotrimerization of isocyanates using N-heterocyclic olefins under bulk conditions
Li, Chengkai,Zhao, Wuchao,He, Jianghua,Zhang, Yuetao
supporting information, p. 12563 - 12566 (2019/10/28)
With a catalyst loading as low as 0.005%, high to excellent yields 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.
