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Polymers 2017, 9(4), 131; doi:10.3390/polym9040131

Living Polymerization of Propylene with ansa-Dimethylsilylene(fluorenyl)(cumylamido) Titanium Complexes

1
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China
2
State Key Laboratory of Polyolefins and Catalysis, Shanghai Research Institute of Chemical Industry, Shanghai 200062, China
3
Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima 739-8527, Japan
*
Authors to whom correspondence should be addressed.
Received: 9 March 2017 / Revised: 31 March 2017 / Accepted: 3 April 2017 / Published: 5 April 2017
(This article belongs to the Special Issue Metal Complexes-Mediated Catalysis in Polymerization)
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Abstract

A series of ansa-silylene(fluorenyl)(amido) titanium complexes (1a1c, 2a, and 2b) bearing various substituents on the amido and fluorenyl ligands are synthesized and characterized by elemental analysis, 1H NMR, and single crystal X-ray analysis. The coordination mode of the fluorenyl ligand to the titanium metal is η3 manner in each complex. The propylene polymerization is conducted with these complexes at 0 and 25 °C in a semi batch-type method, respectively. The catalytic activity of 1a1c bearing cumyl-amido ligand is much higher than that of 2a and 2b bearing naphthyl group in amido ligand. High molecular weight polypropylenes are obtained with narrow molecular weight distribution, suggesting a living nature of these catalytic systems at 0 °C. The polymers produced are statistically atactic, regardless of the structure of the complex and the polymerization temperature. View Full-Text
Keywords: constrained geometry catalysts; propylene; living polymerization; stereospecificity constrained geometry catalysts; propylene; living polymerization; stereospecificity
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Wang, H.; Wang, X.; Sun, Y.; Cheng, H.; Shiono, T.; Cai, Z. Living Polymerization of Propylene with ansa-Dimethylsilylene(fluorenyl)(cumylamido) Titanium Complexes. Polymers 2017, 9, 131.

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