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• 221391-09-9 2,6-bis[1-(2,4-dimethylphenylimino)ethyl]-pyridine 

Relevant academic research and scientific papers

Ethylene oligomerization catalyzed by a novel iron complex containing fluoro and methyl substituents

A novel 2,6-bis(imino)pyridyl iron complex, [2,6-(2-F-4-CH 3C6H3N=CCH3)2C 5H3N]FeCl2·H2O (3) has been synthesized by the reaction of the corresponding bis(imino)pyridyl ligand with FeCl2·4H2O in tetrahydrofuran (THF). The activity of complex 3 reaches to 107 g/mol Fe h in ethylene oligomerization, and the products are mostly (>90%) 1-butene, 1-hexene and 1-octene. As reaction temperature increases, the activities decrease rapidly and the product distributions shift to the low-molecular-weight part. The product distributions are almost unchanged when the Al/Fe molar ratio increases from 420 to 2500, but the catalytic activities increase rapidly at first and then decrease. Other three complexes {2,6-(2-X-4-Y-6-ZC6H3N=CCH 3)2C5H3N}FeCl2· nH2O (X = CH3, Y = CH3, Z = H, n = 0 (1), X = F, Y = H, Z = F, n = 1 (2)) and {Fe[2,6-(2-FC6H3N=CCH 3)2C5H3N]2} 2+[FeCl4]2-·H2O (4) have been also synthesized for comparison and used for ethylene oligomerization. The ortho and para substituents on aniline have performed effects on oligomerization activities and distributions of oligomers for 2,6-bis(imino)pyridyl iron complexes.

Propylene bulk phase oligomerization with bisiminepyridine iron complexes in a calorimeter: Mechanistic investigation of 1,2 versus 2,1 propylene insertion

Iron(II) complexes were synthesized with bisiminepyridine ligands of low steric demand. Activation with modified-methylaluminoxane (25 mol.% isobutyl groups) generated very active catalysts for propylene oligomerization. The oligomerizations were carried out in liquid propylene in a heat flow calorimeter. The oligomers were separated by preparative gas chromatography and the dimers and trimers analyzed using analytical gas chromatography, 1 H-NMR- and 13C-NMR-spectroscopy. With knowledge of the dimer and trimer structure, we were able to establish a mechanistic pathway for propylene insertion and obtained knowledge about the iron alkyl species involved. Analysis of the various dimers formed allowed us to determine the percentage of 1,2 versus 2,1 propylene insertions. Considering the same iron alkyl species with ligands of different steric demand, a change in the probabilities for 1,2 versus 2,1 propylene insertions can be observed. With this knowledge, the catalyst behavior for ligands of varying steric demand can be predicted.

Heterogenized iron(II) complexes as highly active ethene polymerization catalysts

The synthesis of new iron(II) diiminopyridine complexes and their heterogenization to give highly active ethene polymerization catalysts is described. The ligands are characterized by 1H NMR, 13C NMR spectroscopy and GC/MS. The compl

Novel olefin polymerization catalysts based on iron and cobalt

A new family of olefin polymerization catalysts, derived from iron and cobalt complexes bearing 2,6-bis(imino)pyridyl ligands, is described.