219868-28-7Relevant academic research and scientific papers
Cationic Zirconocene Complexes with Benzyl and Si(SiMe3)3 Substituted Cyclopentadienyl Ligands
Bochmann, Manfred,Green, Malcolm L. H.,Powell, Annie K.,Sasmannshausen, Joerg,Triller, Michael,Wocadlo, Sigrid
, p. 43 - 50 (2007/10/03)
Alkyl zirconocenes (where R = CH2Ph, X = Cl 1a or Me 1b; R = CHPh2, X = Cl 2a or Me 2b; R = Si(SiMe3)3, X = Cl 4a or Me 4b) and for comparison 3a were prepared and characterised. The reactions of these compounds with the methide abstracting reagents B(C6F5)3, B(o-C6F5C6F4)3 and +- were investigated by low temperature NMR spectroscopy. Compound 1b reacts with +- to form the homodinuclear complex 2(μ-Me)>+-. The related compound 2(μ-Me)>+- 5a was formed from the reaction of 1b with 0.5 equivalent of B(C6F5)3. Reaction between 1b and 1 equivalent B(C6F5)3 gave 6a and the ion pair 6b which are in equilibrium with each other. A similar observation was made when 2b was used instead of 1b. The sterically more demanding 4b does not show this behaviour. The role of the ligands in ethylene polymerisation was investigated.
