Synthesis of π-Extended Siloles Using Intramolecular Chain Hydrosilylation

Intramolecular chain hydrosilylation afforded benzo- and naphtho-fused siloles in 20–81% yields from the corresponding hydrosilanes in the presence of a small amount of trityl tetrakis(pentafluorophenyl)borate as an initiator. This hydrosilylation can be applied for the synthesis of disiloles such as 1,5-disila-1,5-dihydro- s -indacene and naphthodisiloles.