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Polymers 2017, 9(4), 131;

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

State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China
State Key Laboratory of Polyolefins and Catalysis, Shanghai Research Institute of Chemical Industry, Shanghai 200062, China
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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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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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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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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