Polymerization of Ethylene by the Electrophilic Mixed Cyclopentadienylpyridylalkoxide Complexes [CpM{NC5H4(CR2O)-2}Cl2] (M = Ti, Zr, R = Ph, Pri)

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• 作者：Simon Doherty ; R. John Errington ; Adam P. Jarvis ; Scott Collins ; William Clegg ; and Mark R. J. Elsegood
• 刊名：Organometallics
• 出版年：1998
• 出版时间：August 3, 1998
• 年：1998
• 卷：17
• 期：16
• 页码：3408 - 3410
• 全文大小：55K
• 年卷期：v.17,no.16(August 3, 1998)
• ISSN：1520-6041

文摘

The group 4 mixed-ligand compounds [CpM{NC₅H₄(CR₂O)-2}Cl₂] (M = Ti; R = Prⁱ (1a), Ph (1b);M = Zr, R = Prⁱ (2a), Ph (2b)) have been prepared andcharacterized. Single-crystal X-ray analyses reveal that1a and 2b adopt four-legged piano-stool structures inwhich the cyclopentadienyl ligand is asymmetricallybonded and the pyridylalkoxide is bidentate. Toluenesolutions of [CpM{NC₅H₄(CR₂O)-2}Cl₂] and methylaluminoxane catalyze the polymerization of ethylene, generating high molecular weight polymers with narrowmolecular weight distributions. The activity of thetitanium- and zirconium-based catalysts are comparable.