A Cyclic Disilylated Stannylene: Synthesis, Dimerization, and Adduct Formation

Reaction of 1,4-dipotassio-1,1,4,4-tetrakis(trimethylsilyl)tetramethyltetrasilane with [(Me₃Si)₂N]₂Sn led to the formation of an endocyclic distannene via the dimerization of a transient stannylene. In the presence of strong donor molecules such as PEt₃, the stannylene could be trapped as adduct. Reaction of the PEt₃ derivative with B(C₆F₅)₃ gave rise to the formation of the stannylene B(C₆F₅)₃ adduct.