Synthesis of tris- and tetrakis(pentafluoroethyl)silanes.
Synthesis of tris- and tetrakis(pentafluoroethyl)silanes.
复制标题
三（五氟乙基）硅烷和四（五氟乙基）硅烷的合成。
作者：
S. Steinhauer;Julia Bader;H. Stammler;N. Ignat’ev;B. Hoge
本文报道了用直接酯化法合成高刘易斯酸性三（五氟乙基）硅烷和四（全氟烷基）硅烷Si（C_2F_5）_4和Si（C_2F_5）_3CF_3的全过程。SiCl 4与LiC2F5的反应总是得到（五氟乙基）氟硅酸盐。为了避免由LiC2F5的氟化物转移形成硅酸盐，硅烷的刘易斯酸性必须通过给电子取代基（例如二烷基氨基）来降低。容易获得的Si（C2F5）3NEt2是一系列三（五氟乙基）硅烷的有价值的前体。
The synthesis and complete characterization of functional, highly Lewis acidic tris(pentafluoroethyl)silanes as well as tetrakis(perfluoroalkyl)silanes Si(C2F5)4 and Si(C2F5)3 CF3 by direct fluorination is described. The reaction of SiCl4 with LiC2F5 invariably affords (pentafluoroethyl)fluorosilicates. To avoid silicate formation by fluoride transfer from LiC2F5 the Lewis acidity of the silane has to be decreased by electron-donating substituents, such as dialkylamino groups. The easily accessible Si(C2F5)3 NEt2 is a valuable precursor for a series of tris(pentafluoroethyl)silanes.