Chromium Complexes with Me2Si-Bridged Cyclopentadienyl-imidazolin-2-imine Ligands: Synthesis, Structure, and Use in Ethylene Polymerization Catalysis

2008 ◽  
Vol 27 (13) ◽  
pp. 3232-3239 ◽  
Author(s):  
Sören Randoll ◽  
Peter G. Jones ◽  
Matthias Tamm
Keyword(s):  
Ethylene Polymerization ◽  
Chromium Complexes ◽  
Polymerization Catalysis ◽  
Imine Ligands

Chromium complexes supported by the bidentate PN ligands: synthesis, characterization and application for ethylene polymerization

2018 ◽  
Vol 47 (38) ◽  
pp. 13459-13465 ◽  
Author(s):  
Quande Zheng ◽  
Dejuan Zheng ◽  
Binghao Han ◽  
Shaofeng Liu ◽  
Zhibo Li
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Ethylene Polymerization ◽  
Chromium Complexes ◽  
Highly Active ◽  
Imine Ligands

Chromium complexes bearing phosphine–imine ligands are highly active for ethylene polymerization and produce HDPE with a high molecular weight.

scholarly journals Molecular weight control in organochromium olefin polymerization catalysis by hemilabile ligand–metal interactions

2016 ◽  
Vol 12 ◽  
pp. 1372-1379 ◽  
Author(s):  
Stefan Mark ◽  
Hubert Wadepohl ◽  
Markus Enders
Keyword(s):  
Ethylene Polymerization ◽  
Weight Control ◽  
Transfer Reactions ◽  
High Catalytic Activity ◽  
Co Catalyst ◽  
Metal Centers ◽  
Molecular Weights ◽  
Metal Interactions ◽  
Polymerization Catalysis ◽  
Very High

A series of Cr(III) complexes based on quinoline-cyclopentadienyl ligands with additional hemilabile side arms were prepared and used as single-site catalyst precursors for ethylene polymerization. The additional donor functions interact with the metal centers only after activation with the co-catalyst. Evidence for this comes from DFT-calculations and from the differing behavior of the complexes in ethylene polymerization. All complexes investigated show very high catalytic activity and the additional side arm minimizes chain-transfer reactions, leading to increase of molecular weights of the resulting polymers.

Ethylene Polymerization Catalysis by Vanadium-Based Systems Bearing Sulfur-Bridged Calixarenes

2011 ◽  
Vol 30 (21) ◽  
pp. 5620-5624 ◽  
Author(s):  
Carl Redshaw ◽  
Lucy Clowes ◽  
David L. Hughes ◽  
Mark R. J. Elsegood ◽  
Takehiko Yamato
Keyword(s):  
Ethylene Polymerization ◽  
Polymerization Catalysis

Paramagnetic (Benzyl)chromium Complexes as Homogeneous Ethylene Polymerization Catalysts

1995 ◽  
Vol 14 (2) ◽  
pp. 738-745 ◽  
Author(s):  
Gautam Bhandari ◽  
Youhyuk Kim ◽  
Jeffrey M. McFarland ◽  
Arnold L. Rheingold ◽  
Klaus H. Theopold
Keyword(s):  
Ethylene Polymerization ◽  
Chromium Complexes ◽  
Polymerization Catalysts

2,6-Diiminopyridine Iron(II) Dialkyl Complexes. Interaction with Aluminum Alkyls and Ethylene Polymerization Catalysis

2005 ◽  
Vol 24 (21) ◽  
pp. 4878-4881 ◽  
Author(s):  
Juan Cámpora ◽  
A. Marcos Naz ◽  
Pilar Palma ◽  
Eleuterio Álvarez ◽  
Manuel L. Reyes
Keyword(s):  
Ethylene Polymerization ◽  
Polymerization Catalysis ◽  
Aluminum Alkyls

Synthesis, mechanism and ethylene polymerization catalysis of Ge(iv), Sn(ii) and Zr(iv) complexes derived from substituted β-diketiminates

RSC Advances ◽  
2016 ◽  
Vol 6 (65) ◽  
pp. 60723-60728 ◽  
Author(s):  
Xia Xiao ◽  
Xiaomin Hao ◽  
Jianliang Bai ◽  
Jianbin Chao ◽  
Wei Cao ◽  
...  
Keyword(s):  
Ethylene Polymerization ◽  
Elimination Reaction ◽  
Synthesis Mechanism ◽  
X Ray ◽  
Polymerization Catalysis

Unusual X-ray characterized crystalline Sn(ii), Ge(iv) and Zr(iv) complexes have been prepared via a salt metathesis and elimination reaction.

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