329009-67-8

Upstream product

• 24356-01-2 tetrabenzylzirconium(IV) 
• 418758-31-3 ZrCl₂C₅H₄NCH₂N(O(C₄H₉)2C₆H₂CH₂)2 
• 6921-34-2 benzylmagnesium chloride 
• 3731-51-9 2-(Aminomethyl)pyridine 
• 96-76-4 2,4-di-tert-Butylphenol 
• 276866-85-4 N-(2-pyridylmethyl)-N,N-bis(2-hydroxy-3,5-di-tert-butylbenzyl)amine 

Relevant academic research and scientific papers

Zirconium complexes of diamine-bis(phenolate) ligands: Synthesis, structures, and solution dynamics

A study was performed on the synthesis, structures and solution dynamics of zirconium complexes of diamine-bis(phenolate) ligands. A series of six- or eight-coordinate derivatives were prepared and crystallographically characterized. It was found that attempts to generate catalytically active systems for the polymerization of ethylene were unsuccessful, although THF-stabilized benzyl cations were identified.

Comparison of selected zirconium and hafnium amine bis(phenolate) catalysts for 1-hexene polymerization

The kinetics of 1-hexene polymerization using a family of three zirconium and hafnium amine bis-phenolate catalysts, M[t-Bu-ONXO]Bn2 (where M = Zr (a) or Hf (b), and X = THF (1), pyridine (2), or NMe2 (3)), have been inves

Effects of pendant ligand binding affinity on chain transfer for 1-hexene polymerization catalyzed by single-site zirconium amine bis-phenolate complexes

The kinetics of 1-hexene polymerization using a family of five zirconium amine bis-phenolate catalysts, Zr[tBu-ONXO]Bn2 (where X = THF (1), pyridine (2), NMe2 (3), furan (4), and SMe (5)), has been investigated to uncover

Zirconium complexes of amine-bis(phenolate) ligands as catalysts for 1-hexene polymerization: Peripheral structural parameters strongly affect reactivity

Novel amine bis(phenolate) zirconium dibenzyl complexes were synthesized in quantitative yields from a versatile family of chelating amine-bis((2-hydroxyaryl)methyl) ligand precursors, their X-ray structures solved, and their reactivity in the polymerization of 1-hexene in the presence of B(C6F5)3 studied. Several minor peripheral structural modifications were studied and found to have a major influence on the catalyst performance. Thus, a variety of reactivities, ranging from extremely high to negligible, were obtained, demonstrating a unique structure-reactivity relationship. This relationship is partially revealed from the crystal structures of the precatalysts, indicating similar [ONO] ligand cores in all structures solved. A correlation between the solid and the solution structures is obtained from 1H NMR spectra, which reveal a rigid binding of the ligand to the metal. The solid structures are therefore proposed to serve as reliable references when studying structure-reactivity relationships. The most significant structural parameter was found to be the existence of an extra donor located on a pendant arm. [ONO]-type pentacoordinate complexes lacking such an additional donor are rapidly deactivated and lead only to traces of oligomers. On the other hand, hexacoordinate complexes based on [ONNO]-type ligands, in which strong donation of a side donor to the metal is obtained through formation of a five-membered chelate, lead to extremely reactive polymerization catalysts. The nitrogen hybridization and aromatic ring substituents have a more subtle effect on reactivity. Increasing the chelate size results in either no binding of the side donor, yielding negligible reactivity, or strong binding yet moderate polymerization reactivity. Increasing the steric bulk on the donor results in weakening of the metal-donor bond, leading to a moderate oligomerization catalyst. The sidearm nitrogen is therefore proposed to play a crucial role in determining the propagation process rate, as well as the propagation/termination rate ratio.