corresponding fluorosilicic acids. Mono‐ and bis(pentafluoroethyl)‐substituted fluorosilicic acids were prepared through conversion of the respective halosilanes (Si(C2F5)nX4−n, with X=Cl, Br) with aqueous HF, and were obtained as colorless solids. They can be stored at room temperature for several months without decomposition, and thus are the first examples of stable fluorosilicic acids.
纯无水六氟硅酸(H 2 [SiF 6 ])仍然是可捉摸的物质,尽管它在水溶液中的存在已被充分证明。干燥不可避免地导致分解以形成四氟硅烷和氟化氢。六氟硅酸氧鎓在室温下不稳定。用强吸电子的全氟烷基部分取代氟原子可导致相应的氟硅酸基本稳定。单和双(五氟乙基)取代的氟硅酸是通过各自的卤代硅烷(Si(C 2 F 5)n X 4- n,X = Cl,Br)和HF水溶液,得到无色固体。它们可以在室温下保存几个月而不分解,因此是稳定的氟硅酸的首例。
Chlorosilicates represent important intermediates in SN2 reactions of chlorosilanes. They can be stabilized by the introduction of electron‐withdrawing substituents. Salts of various (pentafluoroethyl)chlorosilicates have been isolated and structurally characterized.
氯硅酸盐是氯硅烷在S N 2反应中的重要中间体。可以通过引入吸电子取代基来稳定它们。各种(五氟乙基)氯硅酸盐的盐已经被分离出来并在结构上进行了表征。