1333435-32-7Relevant academic research and scientific papers
From Prochiral N-Heterocyclic Carbenes to Optically Pure Metal Complexes: New Opportunities in Asymmetric Catalysis
Kong, Lingyu,Morvan, Jennifer,Pichon, Delphine,Jean, Marion,Albalat, Muriel,Vives, Thomas,Colombel-Rouen, Sophie,Giorgi, Michel,Dorcet, Vincent,Roisnel, Thierry,Crévisy, Christophe,Nuel, Didier,Nava, Paola,Humbel, Stéphane,Vanthuyne, Nicolas,Mauduit, Marc,Clavier, Hervé
, p. 93 - 98 (2020)
Well-defined optically pure transition metal (TM) complexes bearing C1- and C2-symmetric N-heterocyclic carbene (NHC) ligands were prepared from prochiral NHC precursors. As predicted by DFT calculations, our strategy capitalizes on
Synthesis and characterisation of an N-heterocyclic carbene with spatially-defined steric impact
Shaw, Paul,Kennedy, Alan R.,Nelson, David J.
, p. 11772 - 11780 (2016)
The synthesis and co-ordination chemistry of a new 'bulky yet flexible' N-heterocyclic carbene ("IPaul") is reported. This carbene has spatially-defined steric impact; steric maps show that two quadrants are very bulky while the other two are quite open.
Zirconium complexes bearing bis(phenoxy-imine) ligands with bulky o-bis(aryl)methyl-substituted aniline groups: Synthesis, characterization and ethylene polymerization behavior
Li, Aike,Ma, Haiyan,Huang, Jiling
, p. 341 - 347 (2013/07/28)
A series of bis(phenoxy-imine) zirconium complexes bearing bulky o-bis(aryl)methyl-substituted aryl groups on the aniline moiety have been synthesized, characterized and tested as catalyst precursors for ethylene polymerization. 1H NMR spectroscopy suggests that these complexes exist as a single chiral C2-symmetric isomer in the solution. X-ray crystallographic analysis of the resulting biszwitterionic-type adduct complex C1 · 2HCl reveals that the phenoxy-imine groups function as a monodentate phenoxy ligand and the oxygen atoms are oriented trans to each other at the central metal atom. Using modified methylaluminoxane (MMAO) as co-catalyst, C1 · 2HCl, C2-C6 exclusively produce linear aluminium-terminated polyethylenes (Al-PEs) with high activity (up to 16.89 × 106 g PE (mol Zr h)-1, suggesting that chain transfer to aluminum is the predominant termination mechanism. It is noteworthy that the introduction of an excessively bulky o-bis(aryl)methyl substituent adjacent to the imine-N produces low molecular-weight Al-PEs (Mv 1.6-10.1 × 103) due to the enhanced rate of chain transfer to alkylaluminium groups during polymerization. Copyright
