Picture of wind turbine against blue sky

Open Access research with a real impact...

The Strathprints institutional repository is a digital archive of University of Strathclyde research outputs.

The Energy Systems Research Unit (ESRU) within Strathclyde's Department of Mechanical and Aerospace Engineering is producing Open Access research that can help society deploy and optimise renewable energy systems, such as wind turbine technology.

Explore wind turbine research in Strathprints

Explore all of Strathclyde's Open Access research content

Synthesis of zirconocene amides and ketimides and an investigation into their ethylene polymerization activity

Henderson, K.W. and Hind, A. and Kennedy, A.R. and McKeown, A.E. and Mulvey, R.E. (2002) Synthesis of zirconocene amides and ketimides and an investigation into their ethylene polymerization activity. Journal of Organometallic Chemistry, 656 (1-2). pp. 63-70. ISSN 0022-328X

Full text not available in this repository. (Request a copy from the Strathclyde author)

Abstract

The zirconocene amide [Cp2Zr(Cl)N(CH2Ph)(2)] (5), and the zirconbcene ketimides [Cp2Zr(Cl)N=C(Bu')Ph] (7), and [Cp2Zr(Cl)N=C(NMe2)(2)] (9), have been prepared by the transmetallation reactions between the appropriate lithiated organonitrogen compounds and zirconocene dichloride (2). In addition, their methylated derivatives [Cp2Zr(Me)N(CH2Ph)(2)] (6), [Cp2Zr(Me)N=C(Bu')Ph] (8), and [Cp2Zr(Me)N=C(NMe2)(2)] (10), have been prepared by the reaction of each of the complexes 5, 7 and 9 with MeLi. Compounds 5 and 7 have been characterized by X-ray crystallography and the structure of the cocrystalline complex [Cp2Zr(Cl)N=C(Bu)Ph](0.4)[Cp2Zr(Me)N=C(Bu')Ph](0.6) (14), has similarly been determined. All of the complexes 5-10 are active catalysts for the polymerization of ethylene in the presence of a MAO cocatalyst. In contrast, no polymer was produced using B(C6F5)(3) as an activator, indicating that direct alkene insertion into the Zr-N bonds does not occur.