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Synthesis and characterization of the catalytic isotactic-specific metallocene complex (η5-C5H3C4H9-CMe2-η5-C13H8)ZrCl2 Mechanistic aspects of the formation of isotactic polypropylene, the stereoregulative effect of the distal substituent and the relevance of C2 symmetry

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Abstract

The reaction of ZrCl4 with the dilithium salt of 2-(tertiarybutyl-3-cyclopentadienyl)-2-(fluorenyl)propane in pentane leads to the formation of the complex (η5-C5H3C4H9-CMe2-η5-C13H8)ZrCl2. characterized by single crystal X-ray diffraction and different NMR methods. When activated with methylaluminoxane or other appropriate ionizing agents the title complex catalyzes the stereospecific polymerization of propylene to isotactic polypropylene.

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Cited by (54)

  • Structure and physical properties of syndiotactic polypropylene: A highly crystalline thermoplastic elastomer

    2006, Progress in Polymer Science (Oxford)
    Citation Excerpt :

    However, even by solution polymerizations highly syndiotactic polypropylene samples with low contents of mm defects and concentration of rrrr pentad higher than 90%, with melting temperatures as high as 150 °C, can be obtained with the catalyst 1 of Chart 2 at polymerization temperatures between 0 °C and ambient temperature [47] (see Section 7). Changes in the structure of the metallocene complex produce differences in catalytic behavior [42,48]. In particular, when the transition metal in the complex 1 of Chart 2 is Ti instead of Zr, a syndiotactic polymer is never obtained [49].

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In memory of Professor Hidemasa Takaya.

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