1516-65-0Relevant articles and documents
Synthesis of tris- and tetrakis(pentafluoroethyl)silanes
Steinhauer, Simon,Bader, Julia,Stammler, Hans-Georg,Ignat'Ev, Nikolai,Hoge, Berthold
supporting information, p. 5206 - 5209 (2014/05/20)
The synthesis and complete characterization of functional, highly Lewis acidic tris(pentafluoroethyl)silanes as well as tetrakis(perfluoroalkyl)silanes Si(C2F5)4 and Si(C2F 5)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 to be decreased by electron-donating substituents, such as dialkylamino groups. The easily accessible Si(C2F5) 3NEt2 is a valuable precursor for a series of tris(pentafluoroethyl)silanes. Special eFfects: functional and highly Lewis acidic tris(pentafluoroethyl)silanes as well as the tetrakis(perfluoroalkyl) silanes Si(C2F5)4 and Si(C2F 5)3CF3 are prepared. The two tetrakis species were formed in the direct fluorination of tris-(pentafluoroethyl)ethyl- and methylsilane. Si(C2F5)4 was characterized by X-ray crystallography (see figure).
Fluorine chemistry - Wittig based synthesis of volatile organofluorine compounds
Bhadury, Pinaki S.,Singh, Sapna,Sharma, Mamta,Palit, Meehir,Jaiswal, Devendra K.
, p. 1186 - 1191 (2007/10/03)
A simple and practical method has been developed for the synthesis and characterization of several interesting classes of volatile organofluorine compounds from fluorophosphonium salts via their in situ generated corresponding ylides. The fluorinated phosphonium ylides react with hexafluoroacetone in DMF to generate perfluoroisobutylene, whereas in the presence of bromine or iodine containing electrophiles, tetrafluoroethylene, perfluoro-2-butene, perfluorocyclobutane, and 1H-heptafluoropropane are obtained.
NEW DATA ON THE MECHANISM OF THERMAL TRANSFORMATIONS OF PERFLUOROOLEFINS. BIRADICAL INTERMEDIATES
Buravtsev, N. N.,Kolbanovskii, Yu. A.,Ovsyannikov, A. A.
, p. 1891 - 1900 (2007/10/03)
It was shown by kinetic spectroscopy that biradicals are formed during the thermal gas-phase transformations of perfluoroolefins and perfluorinated small rings under strictly homogeneous conditions of pulsed adiabatic compression.The role of these radicals in the mechanism of the transformations of perfluoroolefins is discussed.The rate constants and equilibrium constants of some elementary stages are determined.