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 0022-328XFull text not available in this repository. (Request a copy from the Strathclyde author)
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.
|Keywords:||zirconium, amides, ketimides, catalysis, polymerization, Chemistry, Materials Chemistry, Biochemistry, Organic Chemistry, Physical and Theoretical Chemistry, Inorganic Chemistry|
|Subjects:||Science > Chemistry|
|Department:||Faculty of Science > Pure and Applied Chemistry
|Depositing user:||Mr Derek Boyle|
|Date Deposited:||28 Mar 2006|
|Last modified:||29 Apr 2016 07:29|