Group 4 metallocene complexes with annulated twelve-membered ring cyclopentadienyl ligands: their synthesis, characterization and catalytic behavior in olefin polymerization
| Autor: | Youngkyu Do, Eunkee Hong, Taek Kyu Han, Seong Ihl Woo, M. W Kim |
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| Rok vydání: | 1996 |
| Předmět: |
Steric effects
Cyclopentadiene Organic Chemistry Methylaluminoxane Ring (chemistry) Biochemistry Medicinal chemistry Inorganic Chemistry chemistry.chemical_compound chemistry Cyclopentadienyl complex Materials Chemistry Organic chemistry Physical and Theoretical Chemistry Isostructural Metallocene Tetrahydrofuran |
| Zdroj: | Journal of Organometallic Chemistry. 523:211-219 |
| ISSN: | 0022-328X |
| DOI: | 10.1016/0022-328x(96)06410-8 |
| Popis: | The synthesis, characterization and olefin polymerization properties of Group 4 compounds {1,2-(CH2)10(C5H3)}2MCl2 (M Ti 5, Zr 6, Hf 7) containing annulated twelve-membered ring cyclopentadienyl ligands are reported. The reactions of lithiated annulated cyclopentadiene (Li[1,2-(CH2)10C5H3]) with MCl4(THF)2 (M Ti, Zr) or HfCl4 in tetrahydrofuran gave new metallocene products in reasonable yields, 6 and 7 have been characterized by single crystal X-ray diffraction studies. The compound 6 [7] crystallizes in the orthorhombic space group P212121[P212121], with a = 8.188(1) [8.190(5)] A , b = 11.371(1) [11.352(5)] A , c = 30.253(1) [30.177(8)] A , Z = 4 [4] and V = 2816.6(4) [2805.7] A 3 . Both compounds are isostructural and adopt a distorted tetrahedron around the metal center. The steric crowding of the annulated twelve-membered ring in 6 and 7 is greater than that of the seven-membered ring in {2-Me-4,5-(CH2)3Cp)2ZrCl2. The catalytic behavior of the new metallocenes in propylene and ethylene polymerization has been studie in the presence of excess amount of methylaluminoxane. |
| Databáze: | OpenAIRE |
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