Synthesis, Characterization, and Reactivity of [LiC(SiMe2H)3]·2THF:  Formation of 1,1,3,3-Tetramethyl-2,2,4,4-tetrakis(dimethylsilyl)- 1,3-disilacyclobutane, [Me2SiC(SiMe2H)2]2

Reaction of [HC(SiMe2H)3] with [(CH3)2CH]2NLi in tetrahydrofuran afforded [LiC(SiMe2H)3]·2THF (1) in excellent yield. Reactions of 1 with Me3SiCl, MeSiHCl2, HSiCl3 and MeSiCl3 at −78 °C gave [Me3SiC(SiMe2H)3] (2), [(HMeClSi)C(SiMe2H)3] (3), [(HCl2Si)C(SiMe2H)3] (4), and [(MeCl2Si)C(SiMe2H)3] (5), respectively. At room temperature, reaction between 1 and SiCl4 in toluene resulted in multiple products, including a new highly substituted 1,3-disilacyclobutane [Me2SiC(SiMe2H)2]2 (6). 6 was isolated in moderate yield from reaction of 1 with 2 equiv of SiCl4.