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Stereochemistry of first monomer insertion into a metal-methyl bond : enantioselectivity and diastereoselectivity in 3-methyl 1-pentene polymerization with metallocene catalysts

Stereochemistry of first monomer insertion into a metal-methyl bond : enantioselectivity and diastereoselectivity in 3-methyl 1-pentene 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 a metal-methyl bond : enantioselectivity and diastereoselectivity in 3-methyl 1-pentene polymerization with metallocene catalysts. In: Macromolecules. 30(5), pp. 1267-1271. ISSN 0024-9297. eISSN 1520-5835. Available under: doi: 10.1021/ma9609801

@article{Sacchi1997Stere-23758, title={Stereochemistry of first monomer insertion into a metal-methyl bond : enantioselectivity and diastereoselectivity in 3-methyl 1-pentene polymerization with metallocene catalysts}, year={1997}, doi={10.1021/ma9609801}, number={5}, volume={30}, issn={0024-9297}, journal={Macromolecules}, pages={1267--1271}, author={Sacchi, Maria Carmela and Barsties, Elke and Tritto, Incoronata and Locatelli, Paolo and Brintzinger, Hans-Herbert and Stehling, Udo} }

Tritto, Incoronata Stereochemistry of first monomer insertion into a metal-methyl bond : enantioselectivity and diastereoselectivity in 3-methyl 1-pentene polymerization with metallocene catalysts The stereochemistry of first monomer insertion in the polymerization of racemic 3-methyl-1-pentene ((RS)-3MP1) 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), in the presence of MAO/Al(13CH3)3 cocatalyst has been studied and the results have been compared to those previously obtained using the traditional isospecific TiCl<sub>3</sub>/Al(<sup>13</sup>CH<sub>3</sub>)<sub>3</sub> heterogeneous catalyst. The highest enantioselectivity and diastereoselectivity are observed with the least hindered metallocene (catalyst I). While enantioselectivity decreases due to benzannelation of the ligand with catalyst II, the methyl substitution in the 2-position of the cyclopentadienyl rings with catalyst III causes an almost complete lack of diastereoselectivity. 2013-06-24T16:22:26Z 2013-06-24T16:22:26Z deposit-license Macromolecules ; 30 (1997), 5. - S. 1267-1271 Sacchi, Maria Carmela Locatelli, Paolo Barsties, Elke Tritto, Incoronata Stehling, Udo Sacchi, Maria Carmela Brintzinger, Hans-Herbert Brintzinger, Hans-Herbert Locatelli, Paolo Stehling, Udo Barsties, Elke eng 1997

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