Dianions of 2,4,6-Tricarba-hypho-hexaborane

Derivatives of the trishomotriborirane dianion P are formed when alkali metals react in donor solvents with 1,3,5-triboracyclohexane derivatives. The dianion [(CHMe)3(MeB)3]2 has 20 SE and according to the cluster rules classifies as 2,4,6-tricarba-hypho-hexaborane-diid. However, the compounds exist as contact ion pairs, and are therefore regarded as heterocarboranes (see Section 3.2.8). 

Peralkylated tetracarba-mdo-hexaboranes(6) 56 [72] are extremely stable, and almost inert in air and stable towards H20, in contrast with the parent carbaborane [73], nB/nB magnetization transfer experiments performed at 140 °C for the per-ethyl derivative show that exchange reactions between boron atoms in positions 1 and 6 are very slow. 

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