Reaction of indenyllithium with 1,1-dichlorosilacyclobutane gave a mixture of diastereomeric isomers of 1,1-bis(1-indenyl)-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 3 CB(C 6 F 5 ) 4 to perform ethylene and propylene polymerizations over a very broad range of temperature of polymerization (-55°C ≤ T p ≤ 85°C). Variations of the polymerization activity (A) and molecular weight (MW) withT p were investigated as well as the isotactic yield (IY) in the case of propylene polymerizations. Comparisons of those results with other closely relatedansa -zirconocene precursors were also made.