Titanium and Zirconium Benzyl Complexes Bearing Bulky Bis(amido)cyclodiphosph(III)azanes:  Synthesis, Structure, Activation, and Ethene Polymerization Studies

2006 ◽  
Vol 25 (2) ◽  
pp. 463-471 ◽  
Author(s):  
Kirill V. Axenov ◽  
Ilkka Kilpeläinen ◽  
Martti Klinga ◽  
Markku Leskelä ◽  
Timo Repo
Keyword(s):  
Ethene Polymerization

Synthesis of zirconocene silsesquioxane complexes and their ethene polymerization activity in systems with methylaluminoxane

2010 ◽  
Vol 75 (1) ◽  
pp. 105-119 ◽  
Author(s):  
Vojtech Varga ◽  
Jiří Pinkas ◽  
Róbert Gyepes ◽  
Petr Štěpnička ◽  
Michal Horáček ◽  
...  
Keyword(s):  
Ir Spectra ◽  
Elemental Analysis ◽  
Molar Ratio ◽  
Stoichiometric Ratio ◽  
Polyhedral Oligomeric Silsesquioxanes ◽  
Xps Spectra ◽  
Zirconocene Dichloride ◽  
Order Of Magnitude ◽  
Ethene Polymerization

Protocols for obtaining defined zirconocene complexes with polyhedral oligomeric silsesquioxanes with mono-, di-, and trisilanol functionality (SIPOSS, DIPOSS, and TRIPOSS) were established. The TRIPOSS silanolates binding one zirconocene and one chlorozirconocene moiety, [{(c-C5H9)7Si7O9O3}Zr2Cl(η5-C5H4R)4] (1, R = Bu; 2, R = H), were obtained by reacting the silanol with the respective zirconocene dichloride and triethylamine in CH2Cl2 in a 1.0:3.0:3.0 molar ratio, an excess of the zirconocene dichloride being required to suppress intramolecular dehydration of TRIPOSS. The related SIPOSS complex, [{(c-C5H9)7Si8O12O}2Zr(η5-C5H4Bu)2] (3), was prepared similarly at the stoichiometric ratio of [ZrCl2(η5-C5H4Bu)2]/ SIPOSS/NEt3 equal to 1.0:2.0:2.0. When employed in the 1.0:1.0:1.0 ratio, the same reagents afforded only the impure complex [{(c-C5H9)7Si8O12O}ZrCl(η5-C5H4Bu)2] (4), contaminated with 3 and unreacted [ZrCl2(η5-C5H4Bu)2]. Finally, the zirconocene complexes with SIPOSS and DIPOSS moiety, [{(c-C5H9)7Si8O12O}2Zr(η5-C5H5)2] (5) and [(c-C5H9)7Si7O9(OSiMe3)O2}- Zr(η5-C5H5)2] (6), respectively, were obtained by reacting [ZrMe2(η5-C5H5)2] with stoichiometric amounts of the appropriate silanols. All complexes were characterized by 1H, 13C, 29Si NMR and IR spectra, and by elemental analysis from XPS spectra. Preliminary ethene polymerization experiments showed that compounds 5 or 6 when combined with an excess of methylaluminoxane were nearly as active as [ZrCl2(η5-C5H5)2] whereas compound 2 was by about one order of magnitude less active.

Mechanistic Study of the Calcination of Supported Chromium(III) Precursors for Ethene Polymerization Catalysts

1996 ◽  
Vol 100 (26) ◽  
pp. 11062-11066 ◽  
Author(s):  
V. J. Ruddick ◽  
P. W. Dyer ◽  
G. Bell ◽  
V. C. Gibson ◽  
J. P. S. Badyal
Keyword(s):  
Mechanistic Study ◽  
Polymerization Catalysts ◽  
Ethene Polymerization

Alkylphenyl-Substituted Bis(salicylaldiminato) Titanium Catalysts in Ethene Polymerization

2007 ◽  
Vol 26 (15) ◽  
pp. 3690-3698 ◽  
Author(s):  
Antti Pärssinen ◽  
Tommi Luhtanen ◽  
Martti Klinga ◽  
Tapani Pakkanen ◽  
Markku Leskelä ◽  
...  
Keyword(s):  
Titanium Catalysts ◽  
Ethene Polymerization

Ethene Polymerization Catalyzed by Monoalkyl-Substituted Zirconocenes. Possible Effects of Ligand−Metal Agostic Interaction

2000 ◽  
Vol 33 (22) ◽  
pp. 8136-8145 ◽  
Author(s):  
Knut Thorshaug ◽  
Jon Andreas Støvneng ◽  
Erling Rytter
Keyword(s):  
Agostic Interaction ◽  
Ethene Polymerization

Chelate Bis(imino)pyridine Cobalt Complexes:  Synthesis, Reduction, and Evidence for the Generation of Ethene Polymerization Catalysts by Li+Cation Activation

2005 ◽  
Vol 127 (40) ◽  
pp. 13955-13968 ◽  
Author(s):  
Nina Kleigrewe ◽  
Winfried Steffen ◽  
Tobias Blömker ◽  
Gerald Kehr ◽  
Roland Fröhlich ◽  
...  
Keyword(s):  
Cobalt Complexes ◽  
Polymerization Catalysts ◽  
Cation Activation ◽  
Ethene Polymerization

Chromium(III) complexes bearing N,N-chelate ligands as ethene polymerization catalysts

1998 ◽  
pp. 1651-1652 ◽  
Author(s):  
Vernon C. Gibson ◽  
Claire Newton ◽  
Carl Redshaw ◽  
Gregory A. Solan ◽  
Andrew J. P. White ◽  
...  
Keyword(s):  
Polymerization Catalysts ◽  
Chelate Ligands ◽  
Ethene Polymerization

Ethene Polymerization Behavior of MAO-Activated Dichloridotitanium Complexes Bearing Bi- and Tetradentate Salicylaldimine Derivatives

2010 ◽  
Vol 2010 (2) ◽  
pp. 266-274 ◽  
Author(s):  
Antti Pärssinen ◽  
Tommi Luhtanen ◽  
Tapani Pakkanen ◽  
Markku Leskelä ◽  
Timo Repo
Keyword(s):  
Polymerization Behavior ◽  
Ethene Polymerization

Ethene polymerization with modified-polypropene-supported highly stable Ziegler catalyst

1996 ◽  
Vol 17 (1) ◽  
pp. 25-29 ◽  
Author(s):  
Hideharu Mori ◽  
Kouki Ohnishi ◽  
Minoru Terano
Keyword(s):  
Ethene Polymerization
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