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A Highly Active Catalyst Composed of ansa-Fluorenylamidodimethyltitanium Derivative for Propene Polymerization

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Abstract

Me2Si(C29H36)(NtBu)TiMe2 (4; C29H36, octamethyloctahydrodibenzofluorenyl) was synthesized and characterized by elemental analysis, 1H NMR and single crystal X-ray analysis. The complex was applied for propene polymerization using dried modified methylaluminoxane (dMMAO) as a cocatalyst at 0 °C by a semi-batch method. The catalytic system showed the activity of 11,400 kg-polymer mol-Ti−1 h−1, which was too high to control the polymerization. Batch-wise polymerizations were then conducted by changing the amount of propene in feed. The polymerizations proceeded quantitatively, and the number-average molecular weight increased linearly against the polymer yield with keeping the number of polymer chains constant although the polydispersity indices were broader than that expected in a living polymerization. The results of postpolymerization indicated the smooth chain transfer after the monomer consumption.

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Acknowledgment

We thank Tosoh-Finechem Co. for donating MMAO.

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Authors and Affiliations

  1. Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima, 739-8527, Japan

    Takeshi Shiono, Ryotaro Harada, Zhengguo Cai & Yuushou Nakayama

Authors
  1. Takeshi Shiono
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  2. Ryotaro Harada
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  3. Zhengguo Cai
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  4. Yuushou Nakayama
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Correspondence to Takeshi Shiono.

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Shiono, T., Harada, R., Cai, Z. et al. A Highly Active Catalyst Composed of ansa-Fluorenylamidodimethyltitanium Derivative for Propene Polymerization. Top Catal 52, 675–680 (2009). https://doi.org/10.1007/s11244-009-9215-3

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  • DOI: https://doi.org/10.1007/s11244-009-9215-3

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