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 ButNH2) are reported from reactions involving the [indo-5,6-C2B8H11] anion, the CN anion and/or alkyl isocyanides RNC (for R = But); deamination of the Me3N derivative leads to the first unsubstituted eleven-vertex tricarbaboranes nido-7,8,9-C3B8H12 and [nido-7,8,9-C3B8H11].