Abstract
Reaction of indenyllithium with 1,1-dichlorosilacyclobutane gave a mixture of diastereomeric isomers of 1,1-bis(10ineenyl)-1-silacyclobutane ( 1), and the product was in turn converted into diastereomeric (1,3-propanediyl)silylene-bis(1-indenyl)dichlorozirconium complexes ( 2) in a 5:2 racemic:meso ratio. Complex 2 was activated with either methyl aluminoxane (MAO) or Ph 3CB(C 6F 5) 4 to perform ethylene and propylene polymerization over a very board range of temperature of polymerization (−55°C ≤ T p ≤ 85°C). Variations of the polymerization activity ( A) and molecular weight (MW) with T p were investigated as well as the isotactic yield (IY) in the case of propylene polymerizations. Comparisons of those results with other closely related ansa-zirconocene precursors were also made.
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