Isolation of a planar 1,2-dilithio-disilene and its conversion to a Si–B hybrid 2π-electron system and a planar tetraboryldisilene

Dianionic disilyne: reduction of boryltribromosilane yielded the 1,2-dilithio-disilene 2, which is a powerful transfer reagent for the synthesis of a novel 2π aromatic system and the first tetraboryldisilene.