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)3CF3 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
描述了通过直接氟化作用合成功能性高路易斯酸性三(五氟乙基)硅烷以及四(全氟烷基)硅烷Si(C 2 F 5)4和Si(C 2 F 5)3 CF 3的方法。SiCl 4与LiC 2 F 5的反应总是提供(五氟乙基)氟硅酸盐。为避免氟化物从LiC 2 F 5转移而形成硅酸盐,必须通过供电子性取代基(例如二烷基氨基)降低硅烷的Lewis酸度。易接近的Si(C 2 F5)3 NEt 2是一系列三(五氟乙基)硅烷的有价值的前体。
Intermediates of thermal transformations of perfluoro-organic compounds. New spectral data and reactions
作者:Nikolay N. Buravtsev、Yuly A. Kolbanovsky
DOI:10.1016/s0022-1139(98)00325-x
日期:1999.6
New completely fluorinated intermediates were identified from spectroscopic studies of thermal reactions of perfluoro-olefins, some carbocycles, and perfluoro-oxiranes in the gas phase. Detailed mechanisms of several complex reactions were established. For example, the mechanism of higher perfluoro-olefin synthesis from lower species under pyrolysis was established. Following this mechanism the first