- Iron(II) coordination compounds with ω-alkenyl substituted bis(imino)pyridine ligands: Self-immobilizing catalysts for the polymerization of ethylene
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Coordination compounds of iron(II)chloride with bis(imino)pyridine ligands bearing ω-alkenyl substituents were synthesized and characterized. They can be activated with methylalumoxane (MAO) and then be used as self-immobilizing catalysts for the polymerization of ethylene. The produced polyethylene has a monomodal molecular weight distribution which is in contrast to polyethylenes that are produced with the unsubstituted catalysts.
- Seitz, Marcus,Milius, Wolfgang,Alt, Helmut G.
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p. 246 - 253
(2008/10/09)
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- Influence of the para-substitution in bis(arylimino)pyridine iron complexes on the catalytic oligomerization and polymerization of ethylene
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A series of nine bis(arylimino)pyridine iron complexes containing halogen or alkynyl substituents in their ligand frameworks was synthesized and characterized. After activation with methylalumoxane (MAO), these catalysts oligomerize or polymerize ethylene to give highly linear products. The introduction of halogen or alkynyl substituents in the para-position of the iminophenyl rings has a great influence on the polymerization activities of the corresponding iron complexes.
- G?rl, Christian,Alt, Helmut G.
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p. 4580 - 4592
(2008/02/13)
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- A new iron catalyst for ethylene polymerization
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The iron-based catalyst 2,6-bis[1-(4-bromo-2,6-dimethylphenylimino)ethyl]- pyridineiron(II) chloride, 1, has been successfully synthesized and characterized. Its catalytic activity was evaluated for the polymerization of ethylene at different temperatures and Al/Fe ratios and compared with that of 2,6-bis[1-(2,6-dimethylphenylimino)ethyl]pyridineiron(II) chloride, 2. The results show that the catalytic activity of catalyst 1 is highly dependent on the amount of MAO used in the polymerization of ethylene and presents a maximum value at about 20°C.
- Paulino, Icaro S.,Schuchardt, Ulf
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- Heterogenized iron(II) complexes as highly active ethene polymerization catalysts
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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
- Schmidt, Roland,Welch, M.Bruce,Palackal, Syriac J,Alt, Helmut G
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p. 155 - 173
(2008/10/08)
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- Ethylene polymerization in the presence of iron(II) 2,6-bis(imine)pyridine complex: Structures of key intermediates
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The structures of intermediates generated by the activation of 2,6-bis[1-(2,6-dimethylphenylimino)ethyllpyridineiron(II) chloride (1) with various cocatalysts, methylalumoxane (MAO), trimethylaluminum (TMA), and TMA in combination wilh B(C6F5)3 and Ph3CB(C6F5)4, is studied by 1H and 2HNMR spectroscopy. The 1/AlMe3 system exhibits a higher catalytic activity in ethylene polymerization than the 1/MAO system. The activity of the latter decreases sharply with a decrease in the amount of AlMe3 in MAO. Neutral Fe(II) complexes rather than cationic intermediates are suggested to be active components in both catalytic systems.
- Talzi,Babushkin,Semikolenova,Zudin,Zakharov
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p. 147 - 153
(2008/10/08)
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- Iron and cobalt ethylene polymerization catalysts bearing 2,6- bis(imino)pyridyl ligands: Synthesis, structures, and polymerization studies
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The synthesis, characterization, and ethylene polymerization behavior of a series of iron and cobalt halide complexes, LMX(n) (M = Fe, X = Cl, n = 2, 3, X = Br, n = 2; M = Co, X = Cl, n = 2), bearing chelating 2,6- bis(imino)pyridyl ligands L [L = 2,6-(Ar
- Britovsek, George J. P.,Bruce, Michael,Gibson, Vernon C.,Kimberley, Brian S.,Maddox, Peter J.,Mastroianni, Sergio,McTavish, Stuart J.,Redshaw, Carl,Solan, Gregory A.,Str?mberg, Staffan,White, Andrew J. P.,Williams, David J.
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p. 8728 - 8740
(2007/10/03)
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- Highly active iron and cobalt catalysts for the polymerization of ethylene [18]
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Using the previously examined Ni(II) and Pd(II) α-diimine catalysts as a guide, new iron(II) and cobalt(II) catalysts based on tridentate pyridine bis-mine ligands were prepared. The resulting catalysts are robust and extremely active for polymerization of ethylene to linear, high-density polyethylene.
- Small,Brookhart,Bennett
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p. 4049 - 4050
(2008/10/08)
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- Novel olefin polymerization catalysts based on iron and cobalt
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A new family of olefin polymerization catalysts, derived from iron and cobalt complexes bearing 2,6-bis(imino)pyridyl ligands, is described.
- Britovsek, George J.P.,Gibson, Vernon C.,Kimberley, Brian S.,Maddox, Peter J.,McTavish, Stuart J.,Solan, Gregory A.,White, Andrew J.P.,Williams, David J.
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p. 849 - 850
(2007/10/03)
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