Abstract
The room-temperature reaction between a THF solution of 2,4,7,9-tetracarba-nido-dodecaborane(12) (SiMe3)4C4B8H8 and finely cut excess lithium or magnesium metal, in the absence of naphthalene and aromatic solvents, produced either {[(THF)4Li][(SiMe3)4C4B8H9]} (1) as an EPR-silent transparent crystalline solid in 41% yield or [(THF)2Mg(SiMe3)4C4B8H8] (2) as an off-white crystalline solid in 88% yield. While the solid-state structure of 1 showed a single anionic [(SiMe3)4C4B8H9]- unit that was well-separated from a discrete [Li(THF)4]+ cation, the structure of 2 is that of a novel magnesacarborane in which the carborane cage incorporates both electron-precise and electron-deficient carbon and boron atoms.
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