Reactions of [LiC(SiMe2H)3]·2THF: Sterically hindered tris(dimethylsilyl)methane derivatives and their hydrosilylation

Treatment of LiC(SiMe₂H)₃]·2THF (1) with alkeny1chlorosilanes produced sterically hindered alkenylsilanes (4–10) of structure H₂C=CH---(CH₂)_nSiRR′C(SiMe₂H)₃ (R=Me; R′=Me or Cl; n=0, 1, or 4). The Peterson reaction of 1 with carbonyl compounds gave sterically hindered olefins R(R′)C=C(SiMe₂H)₂. Pt or Rh catalyzed intramolecular hydrosilylation of H₂C=CHSiMe₂C(SiMe₂H)₃ (4) occurred to produce a new 1,3-disilacyclobutane derivative 15. Intermolecular hydrosilylation was favored for 5, 8, and 10, producing oligomeric products.