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

Ureate Titanium Catalysts for Hydroaminoalkylation: Using Ligand Design to Increase Reactivity and Utility

ACS Catalysis ◽  
2021 ◽  
pp. 4550-4560
Author(s):  
Manfred Manßen ◽  
Danfeng Deng ◽  
Cameron H. M. Zheng ◽  
Rebecca C. DiPucchio ◽  
Dafa Chen ◽  
...  
Keyword(s):  
Ligand Design ◽  
Titanium Catalysts

Synthesis of a high-trans 1,4-butadiene/isoprene copolymers with supported titanium catalysts

2003 ◽  
Vol 89 (7) ◽  
pp. 1800-1807 ◽  
Author(s):  
Aihua He ◽  
Baochen Huang ◽  
Shuke Jiao ◽  
Youliang Hu
Keyword(s):  
Titanium Catalysts

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

Self-Supported Heterogeneous Titanium Catalysts for Enantioselective Carbonyl-Ene and Sulfoxidation Reactions

2005 ◽  
Vol 11 (14) ◽  
pp. 4078-4088 ◽  
Author(s):  
Xisheng Wang ◽  
Xingwang Wang ◽  
Hongchao Guo ◽  
Zheng Wang ◽  
Kuiling Ding
Keyword(s):  
Titanium Catalysts

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
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