The first synthesised examples of di-siloxy-substituted cyclopentadienyl zirconocenes,their synthesis,structure and activity in ethylene polymerisation |
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| Affiliation: | 1. Laboratory of Polymer Technology, A˚bo Akademi University, Biskopsgatan 8, FIN-20500 A˚bo, Finland;2. Borealis Polymers Oy, R&D, P.O.Box 330, FIN-06101 Porvoo, Finland;3. Department of Inorganic Chemistry, University of Helsinki, P.O. Box 55, FIN-00014, Finland;1. Key Laboratory for Advanced Materials and Institute of Fine Chemicals, School of Chemistry & Molecular Engineering, East China University of Science and Technology, 130 Mei-Long Road, Shanghai 200237, China;2. State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 354 Fenglin Lu, Shanghai 200032, China;1. Laboratorio de Bionanotecnología, Departamento de Ciencias Químico Biológicas, Universidad Bernardo ÓHiggins, General Gana 1780, Santiago, Chile;2. Departamento de Química Inorgánica, Facultad de Química, Pontificia Universidad Católica de Chile, Casilla 306, Santiago, Chile;3. Department of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, Canada T2N 1N4;4. Institute of Medicinal and Pharmaceutical Chemistry, Technische Universität Braunschweig, Beethovenstr. 55, 38106 Braunschweig, Germany;5. Universidad Andres Bello, Departamento de Ciencias Químicas, Relativistic Molecular Physics (ReMoPh) group, Republica 275, Santiago, Chile;1. Inorganic Chemistry Research Group, Chemical Physics, Chemical Center, Lund University, Box 124, SE-221 00 Lund, Sweden;2. School of Chemistry, Bedson Building, Newcastle University, Newcastle upon Tyne NE1 7RU, UK;3. Department of Chemistry, University of Jyväskylä, P.O. Box 35, FI-40014 Jyväskylä, Finland;1. Industrial Chemistry Research Institute, 8 Rydygiera Street, 01-793 Warsaw, Poland;2. National Medicines Institute, 30/34 Chełmska Street, 00-725 Warsaw, Poland |
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| Abstract: | Bis-(1,2-(RMe2SiO)2)ZrCl2 complexes with R = Me-(5a), iPr-(5b) and tBu-(5c) have been synthesised in good yields and characterised. Compounds 5a–c are the first synthesised examples of multi-siloxy-substituted cyclopentadienyl metallocenes. The siloxy-substituents have a for siloxy substituted metallocenes unique steric arrangement, with one almost in the same plane, and the other nearly perpendicular to the plane of the cyclopentadienyl ligand of the zirconocene. The ethylene/1-hexene co-polymerisation activity using methylalumoxane as co-activator gives low activities, with compound 5c (262.92 kg(PE)/g(Zr)/h) being the most active. |
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