An Electron-Rich Proazaphosphatrane for Isocyanate Trimerization to Isocyanurates
作者:Steven M. Raders、John G. Verkade
DOI:10.1021/jo9023396
日期:2010.8.6
synthesis of the new electron-rich, sterically hindered proazaphosphatrane shown above is described herein. This proazaphosphatrane catalyzes the cyclotrimerization of a wide variety of isocyanates to isocyanurates under mild conditions with unprecedentedly fast reaction times, giving moderate to high product yields. It is also shown that this proazaphosphatrane can be recycled up to 5 times.
A Well‐Defined Calcium Compound Catalyzes Trimerization of Arylisocyanates into 1,3,5‐Triarylisocyanurates
作者:Rohit Kumar、Vishal Sharma、Shailja Jain、Himanshu Sharma、Kumar Vanka、Sakya S. Sen
DOI:10.1002/cctc.202101788
日期:2022.6.8
A well-defined calcium compound (2) was prepared using a tetra-dentate ligand. 2 was found to catalyze the cyclotrimerization of aryl isocyanates to isocyanurates under ambient conditions with excellent yields.