Tricarbollides—compounds of the eleven-vertex series of tricarbaboranes

Abstract

Alternative syntheses of the zwitterionic compounds 7-L-nido-7,8,9-C₃B₈H₁₀(where L = H₂N^–, Me₃N, and Bu^tNH₂) are reported from reactions involving the [indo-5,6-C₂B₈H₁₁]^– anion, the CN^– anion and/or alkyl isocyanides RNC (for R = Bu^t); deamination of the Me₃N derivative leads to the first unsubstituted eleven-vertex tricarbaboranes nido-7,8,9-C₃B₈H₁₂ and [nido-7,8,9-C₃B₈H₁₁]^–.