Zirconium and titanium bis (benzamidinate) dimethyl complexes were found to be active catalytic precursors for the oligomerization of mono-and bis-substituted silanes. The activation of such complexes, by an excess of MAO or by an equimolar amount of B (C6F5) 3, increases the catalytic activity of the complexes and the molecular weight of the obtained oligosilanes. The maximum polymerization index that was accomplished (n= 90) is by far ...