Lithiopentamethyldisilane (LiSiMe2SiMe3, 1a), two isomer of lithioheptamethyltrisilane (LiSiMe2SiMe2SiMe3, 1b; LiSi(SiMe3)2Me, 1c), lithio[tris(trimethylsilyl)]silane (LiSi(SiMe3)3, 1d), 2-lithio-1,3-diphenylpentamethyltrisilane (LiSi(SiMe2Ph)2Me, 1e), 2-lithio-2-phenylhexamethyltrisilane (LiSi(SiMe3)2Ph, 1f), 3-lithio-1,5-diphenylnonamethylpentasilane (LiSi(SiMe2SiMe2Ph)2Me, 1g), lithio[bis(dimethlphenylgermyl)]methylsilane (LiSi(GeMe2Ph)2Me, 1h), and lithiotrimethylsilane (LiSiMe3, 3) were prepared by lithium–mercury exchange reactions. The unsolvated lithiosilanes exist as the aggregated oligomers in non-polar solvents, whereas those solvated by THF or Et2O exist as monomers. Synthesis and detailed spectroscopic studies of the lithiosilanes with Si–Si bonds are reported.
三甲基二
硅烷(LiSiMe2SiMe3,1a)、三甲基七
硅烷的两个异构体(LiSiMe2SiMe2SiMe3,1b;LiSi(SiMe3)2Me,1c)、二
硫[三(三甲基
硅基)]
硅烷(LiSi(SiMe3)3,1d)、2-二
硫-1,3-二苯基五甲基三
硅烷(LiSi(SiMe2Ph)2Me,1e)、2-二
硫-2-苯基六甲基三
硅烷(LiSi(SiMe3)2Ph,1f)、3-二
硫-1、通过
锂汞交换反应制备了 2-
硫代-2-苯基六甲基三
硅烷(LiSi(SiMe3)2Ph, 1f)、3-
硫代-1, 5-二苯基壬基甲基五
硅烷(LiSi(SiMe2SiMe2Ph)2Me, 1g)、
硫代[双(二甲基苯基ermyl)]甲基
硅烷(LiSi(GeMe2Ph)2Me, 1h)和
硫代三甲基
硅烷(LiSiMe3, 3)。未溶解的石
硅烷在非极性溶剂中以聚集低聚物的形式存在,而在 THF 或 Et2O 溶剂中则以单体形式存在。报告还介绍了具有 Si-Si 键的
锂硅烷的合成和详细光谱研究。