Azatricarbaborane 7-t-Bu-arachno-7,1,5,12-NC3B8H12 and parent tricarbaboranes nido-[5,6,9-C3B7H10]- and -5,6,9-C3B7H11

The neutral azatricarbaborane 7-t-Bu-arachno-7,1,5,12-NC3B8H12, isolated as a side product (yield 2%) from the new synthesis of 7-t-BuNH2-nido-7,8,9-C3B8H10 (yield 70%), can be easily converted to the first parent representatives of the 10-vertex nido family of tricarbaboranes, [5,6,9-C3B7H10](-) and 5,6,9-C3B7H11.