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Stereochemistry of first monomer insertion into metal-methyl bond : a tool for evaluating ligand-monomer interactions in propene polymerization with metallocene catalysts

Stereochemistry of first monomer insertion into metal-methyl bond : a tool for evaluating ligand-monomer interactions in propene polymerization with metallocene catalysts

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SACCHI, Maria Carmela, Elke BARSTIES, Incoronata TRITTO, Paolo LOCATELLI, Hans-Herbert BRINTZINGER, Udo STEHLING, 1997. Stereochemistry of first monomer insertion into metal-methyl bond : a tool for evaluating ligand-monomer interactions in propene polymerization with metallocene catalysts. In: Macromolecules. 30(14), pp. 3955-3957. ISSN 0024-9297. eISSN 1520-5835

@article{Sacchi1997Stere-23754, title={Stereochemistry of first monomer insertion into metal-methyl bond : a tool for evaluating ligand-monomer interactions in propene polymerization with metallocene catalysts}, year={1997}, doi={10.1021/ma960720j}, number={14}, volume={30}, issn={0024-9297}, journal={Macromolecules}, pages={3955--3957}, author={Sacchi, Maria Carmela and Barsties, Elke and Tritto, Incoronata and Locatelli, Paolo and Brintzinger, Hans-Herbert and Stehling, Udo} }

1997 Tritto, Incoronata eng Stereochemistry of first monomer insertion into metal-methyl bond : a tool for evaluating ligand-monomer interactions in propene polymerization with metallocene catalysts 2013-06-24T16:57:57Z Stehling, Udo Locatelli, Paolo Sacchi, Maria Carmela Brintzinger, Hans-Herbert Sacchi, Maria Carmela Barsties, Elke Tritto, Incoronata Macromolecules ; 30 (1997), 14. - S. 3955-3957 Barsties, Elke Brintzinger, Hans-Herbert Locatelli, Paolo Propene has been polymerized with three different metallocene complexes:  Me<sub>2</sub>Si(Ind)<sub>2</sub>ZrCl<sub>2</sub> (I), Me<sub>2</sub>Si(BenzInd)<sub>2</sub>ZrCl<sub>2</sub> (II), and Me<sub>2</sub>Si(MeBenzInd)<sub>2</sub>ZrCl<sub>2</sub> (III) by using <sup>13</sup>C-enriched cocatalyst MAO/Al(<sup>13</sup>CH<sub>3</sub>)<sub>3</sub>. The stereochemical analysis of selectively <sup>13</sup>C-enriched methyl chain end groups has shown that, while a moderate first step enantioselectivity is present with catalyst I, the bulky benzannelated substituents (catalysts II and III) lead to an almost total lack of steric control on the first monomer insertion. The methyl substitution in the 2-position of cyclopentadienyl ring (catalyst III) does not seem to influence the choice of the face. 2013-06-24T16:57:57Z Stehling, Udo deposit-license

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