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266ChemInform Abstract The air-stable, crystalline solids (IVa) and (IVb) as well as the air-stable liquid (IVc) are prepared as shown in the scheme. The silicon(II) inserted carboranes (III) are also produced as a by-product in < 1% yield. These silicon (II) species are extremely sensitive to air and/or moisture. In each of these reactions the neutral nido-carborane (V) is isolated in varying yields. The reaction of the silane (VI) produces (VII) which reacts with NaH in THF to yield (VIII). The spectroscopic (IR, 1H, 11B, 13C and 29Si NMR) characterizations indicate that the silicon atoms in (VII) and (VIII) can be either η3-or η5-bonded to the C2B3 faces of the carborane cages. The structure of (IVb) (space group P21/n, Z=2) is determined by an X-ray analysis.