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

(Hydrotris(3,5-dimethylpyrazolyl)borato)niobium Alkyne Complexes:  Dichloro and Dialkyl Derivatives and Formation of a Butadienyl Complex with an α-Agostic Interaction

1996 ◽  
Vol 15 (4) ◽  
pp. 1106-1112 ◽  
Author(s):  
Michel Etienne ◽  
Fabienne Biasotto ◽  
René Mathieu ◽  
Joseph L. Templeton
Keyword(s):  
Agostic Interaction ◽  
Alkyne Complexes

1,5-Cyclooctanediylbis(pyrazol-1-yl)borate: a ligand with enhanced agostic interaction

1992 ◽  
Vol 31 (6) ◽  
pp. 974-979 ◽  
Author(s):  
Swiatoslaw Trofimenko ◽  
Joseph C. Calabrese ◽  
Jeffery S. Thompson
Keyword(s):  
Agostic Interaction

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

Computational studies on the Rh-catalyzed carboxylation of a C(sp2)–H bond using CO2

2017 ◽  
Vol 7 (16) ◽  
pp. 3539-3545 ◽  
Author(s):  
Xiangying Lv ◽  
Linhui Zhang ◽  
Beibei Sun ◽  
Zhi Li ◽  
Yan-Bo Wu ◽  
...  
Keyword(s):  
Lewis Acid ◽  
Computational Studies ◽  
Agostic Interaction

CO2 insertion is facilitated by the critical effects of a Lewis acid and an agostic interaction.

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.

Experimental and Theoretical Evidence for an Agostic Interaction in a Gold(III) Complex

2016 ◽  
Vol 55 (10) ◽  
pp. 3414-3418 ◽  
Author(s):  
Feriel Rekhroukh ◽  
Laura Estévez ◽  
Christian Bijani ◽  
Karinne Miqueu ◽  
Abderrahmane Amgoune ◽  
...  
Keyword(s):  
Agostic Interaction ◽  
Theoretical Evidence

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

Agostic interaction and hydrogen exchange in coordinatively unsaturated ruthenium complexes

1993 ◽  
Vol 12 (9) ◽  
pp. 3393-3395 ◽  
Author(s):  
Masamichi Ogasawara ◽  
Ko Aoyagi ◽  
Masahiko Saburi
Keyword(s):  
Hydrogen Exchange ◽  
Ruthenium Complexes ◽  
Agostic Interaction
Sign in / Sign up

Export Citation Format

Share Document