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Semi-Hydrogenated, Asymmetric Metallocene Catalysts for the Propylene Polymerization

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Published/Copyright: June 2, 2014
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Zeitschrift für Naturforschung B
From the journal Zeitschrift für Naturforschung B Volume 58 Issue 6

The hydrogenation of rac-[1-(9-η5-fluorenyl)-2-(5,6-cylopenta-2-methyl-1-η5-indenyl)ethane] metallocene dichlorides (1a: Zr, 1b: Hf) with PtO2/H2O/H2 is reported. The diastereoselective formation of exclusively rac-[1-(2,3,4,5,6,7,8,9-octahydro-η5-fluorenyl)-2-(2-methyl- 1,4,4a(R;S),5,6,7,7a(S;R),8-octahydro-s-η5-indacenyl)ethane]metallocene dichlorides (2a: Zr, 2b: Hf) was shown by 1H-NMR and by X-ray analysis of 2a. Both compounds were activated in situ with triisobutylaluminum/PhC+3 [B(C6F5)4]D and tested as catalysts in propylene polymerization reactions. Comparison to the non-hydrogenated complexes revealed a decrease in molecular weight of the polymer and in catalyst activity. Experiments at elevated temperatures resulted in a lower stereospecificity and reduced isotacticity values indicating a polymerization mechanism analogous to C2-symmetric catalysts.

Keywords : Metallocene Polymerization Catalyst; Polypropylene; Diastereoselective Hydrogenation
Received: 2003-2-27
Published Online: 2014-6-2
Published in Print: 2003-6-1

© 1946 – 2014: Verlag der Zeitschrift für Naturforschung

Articles in the same Issue

  1. Magnetic Properties of Compounds RE2Cu2Mg (RE = Y, La, Pr, Nd)
  2. Magnetic and Spectroscopic Properties of LiAuSn
  3. Synthesis, Characterization, Crystal Structure and Magnetic Properties of [(en)CuII(ImH)2](ClO4)2 (en = Ethylenediamine, ImH = Imidazole): A Metalloligand as a Building Block for Heterometal Chains
  4. Synthese und Struktur des Ammoniumsesquicarbonat Monohydrates (NH4)4[H2(CO3)3] ·H2O
  5. Ruthenocene mit sterisch anspruchsvollen Cyclopentadienylliganden
  6. R2Sn3 (R = La – Nd, Sm): A Family of Intermetallic Compounds with their Own Triclinic Structure
  7. The Synthesis and Structure of the Two Hexafluorophosphate Salts {Cu[P(C7H7)3](CH3CN)2}PF6 and {Cu[P(C7H7)3]2}PF6 Containing the Ligand Tri(1-cyclohepta-2,4,6-trienyl)phosphane
  8. Semi-Hydrogenated, Asymmetric Metallocene Catalysts for the Propylene Polymerization
  9. Crystal Structures of Heteronuclear Nickel(II)/Zinc(II) Doubly Oxygen Bridged Schiff-Base Complexes
  10. Hydroboration of Bis(trimethylsilylethynyl)silanes with 9-Borabicyclo[3.3.1]nonane. A New Route to 1-Sila-3-cyclopentenes and to a 1-Sila-2,4-cyclopentadiene
  11. Manganiophosphonium-Salze: Synthese, Eigenschaften und Struktur von Komplexen des Typs [CpMn(CO)(NO)PPh2H]BF4 und [Cp′Mn(CO)(NO)PPh2R]X (R = H, CH3, {CpMn(CO)(NO)}; X = BF4, PF6)
  12. Electrochemistry of Acetate-, Carbonate-, Sulfate-, and Dihydrogenphosphate-Bridged Dirhodium(II) Complexes
  13. Synthesis, Crystal and Magnetic Structure of the New Double Perovskite Ba2MnMoO6
  14. Two Atropisomeric N-Methyldioncophyllines A and N-Methylphylline, their Naphthalene-Free Heterocyclic Moiety, from Ancistrocladus barteri
  15. Darstellung von 2,3,8-substituierten Perhydrooxazolo[3,2-a]pyridinen und die Kristallstruktur von (E)-3-(2-Fluorbenzyliden)-1-[1,2-bis(2-fluorphenyl)- 2-hydroxyethyl]-3,4,5,6-tetrahydropyridiniumchlorid
  16. Teilweise Sauerstoff-Wanderung in der photochemischen Wolff-Umlagerung – α-Oxocarben-Oxiren-Isomerisierung oder intermolekularer Mechanismus?
https://doi.org/10.1515/znb-2003-0608
Keywords for this article
Metallocene Polymerization Catalyst; Polypropylene; Diastereoselective Hydrogenation

Articles in the same Issue

  1. Magnetic Properties of Compounds RE2Cu2Mg (RE = Y, La, Pr, Nd)
  2. Magnetic and Spectroscopic Properties of LiAuSn
  3. Synthesis, Characterization, Crystal Structure and Magnetic Properties of [(en)CuII(ImH)2](ClO4)2 (en = Ethylenediamine, ImH = Imidazole): A Metalloligand as a Building Block for Heterometal Chains
  4. Synthese und Struktur des Ammoniumsesquicarbonat Monohydrates (NH4)4[H2(CO3)3] ·H2O
  5. Ruthenocene mit sterisch anspruchsvollen Cyclopentadienylliganden
  6. R2Sn3 (R = La – Nd, Sm): A Family of Intermetallic Compounds with their Own Triclinic Structure
  7. The Synthesis and Structure of the Two Hexafluorophosphate Salts {Cu[P(C7H7)3](CH3CN)2}PF6 and {Cu[P(C7H7)3]2}PF6 Containing the Ligand Tri(1-cyclohepta-2,4,6-trienyl)phosphane
  8. Semi-Hydrogenated, Asymmetric Metallocene Catalysts for the Propylene Polymerization
  9. Crystal Structures of Heteronuclear Nickel(II)/Zinc(II) Doubly Oxygen Bridged Schiff-Base Complexes
  10. Hydroboration of Bis(trimethylsilylethynyl)silanes with 9-Borabicyclo[3.3.1]nonane. A New Route to 1-Sila-3-cyclopentenes and to a 1-Sila-2,4-cyclopentadiene
  11. Manganiophosphonium-Salze: Synthese, Eigenschaften und Struktur von Komplexen des Typs [CpMn(CO)(NO)PPh2H]BF4 und [Cp′Mn(CO)(NO)PPh2R]X (R = H, CH3, {CpMn(CO)(NO)}; X = BF4, PF6)
  12. Electrochemistry of Acetate-, Carbonate-, Sulfate-, and Dihydrogenphosphate-Bridged Dirhodium(II) Complexes
  13. Synthesis, Crystal and Magnetic Structure of the New Double Perovskite Ba2MnMoO6
  14. Two Atropisomeric N-Methyldioncophyllines A and N-Methylphylline, their Naphthalene-Free Heterocyclic Moiety, from Ancistrocladus barteri
  15. Darstellung von 2,3,8-substituierten Perhydrooxazolo[3,2-a]pyridinen und die Kristallstruktur von (E)-3-(2-Fluorbenzyliden)-1-[1,2-bis(2-fluorphenyl)- 2-hydroxyethyl]-3,4,5,6-tetrahydropyridiniumchlorid
  16. Teilweise Sauerstoff-Wanderung in der photochemischen Wolff-Umlagerung – α-Oxocarben-Oxiren-Isomerisierung oder intermolekularer Mechanismus?
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