[{(CH3)(3)Si}(3)C-Li-C{Si(CH3)(3)}(3)][Li center dot 3(OC4H8)] and {(CH3)(3)Si}(3)C-Li center dot O = C(Si(CH3)(3))(2), two new adducts of lithium trisylmethanide

Sublimation of (Tsi-Li) . 2THF (Tsi = -C(Si(CH3)(3))(3)) at 180 degrees C a nd 10(-4) hPa gives (Tsi-Li) 1.5 THF in very low yield. The X-ray structure determination shows an almost linear [Tsi-Li-Tsi](-) anion connected by sh ort agostic Li ... C contacts with the threefold THF-coordinated Li-cation. Base-free Tsi-Li, solved in toluene is decomposed by oxygen, forming the s trawberry-colored ketone O=C(SiMe3)(2), which forms an 1:1 adduct with unde composed Tsi-Li. The X-ray structure elucidation of this compound is also d iscussed.