Chelating Diamide Group IV Metal Olefin Polymerization Catalysts

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• 作者：Jasson T. Patton ; Shaoguang G. Feng ; and Khalil A. Abboud
• 刊名：Organometallics
• 出版年：2001
• 出版时间：August 6, 2001
• 年：2001
• 卷：20
• 期：16
• 页码：3399 - 3405
• 全文大小：87K
• 年卷期：v.20,no.16(August 6, 2001)
• ISSN：1520-6041

文摘

The novel group IV metal chelating diamide complexes [(2,6-diisopropylanilido)B(NMe₂)B(NMe₂)(2,6-diisopropylanilido)]MX₂, 7a (M = Ti, X = Cl), 7b (M = Ti, X = Me), and 8 (M =Zr, X = CH₂Ph), have been prepared and characterized by ¹H and ¹³C{H} NMR spectroscopyand single-crystal X-ray structure analysis (7a). These complexes are active polymerizationcatalysts upon combining with the appropriate activator. The catalyst efficiencies, however,are considerably lower than those of Cp-based catalysts. The molecular weights of thepolymers produced are activator dependent, and the polydispersities were found to be broaderthan those observed for Cp-based single-site catalytic systems.