Reactions involving fluoride ion. Part 22. Dimerisation of perfluoro-2,3-dimethylbutadiene and related reactions
作者:Richard D. Chambers、Andrew A. Lindley、Harold C. Fielding
DOI:10.1039/p19810000939
日期:——
Reaction of perfluoro-2,3-dimethylbutadiene (1) with caesium fluoride gives two dimers, the ratios being very temperature-dependent. The structures of the dimers and mechanism of formation are proposed. A corresponding reaction but in the presence of bromine provides a good route to perfluoro-2,3-dimethylbut-2-ene. Further fluorination of the dimers of (1) occurs over cobalt trifluoride and the product
The conversion of perfluoro-olefins, perfluoroketones or perfluoroacids into perfluoroethers, perfluoroalkylperoxides or perfluorocarbons
作者:R.N. Haszeldine
DOI:10.1016/s0022-1139(00)83241-8
日期:1985.8
Part of a study to synthesise via radical reactions perfluoroalkanes containing oxygen is illustrated with the olefin (CF3)2C:C(CF3)2. Photochemical oxidation of the olefin with short reaction time gives the ketones CF3.CO.CF(CF3)2 (48% yield), CF3.O.CF2.CO.CF3, CF3.O.CF2.CO.CF(CF3)2 and CF3.CO.CF3. The epoxide is a by-product not an intermediate in these reactions.
Fluoro-olefins. Part VIII. Preparation and some reactions of perfluoro-2,3-dimethylbut-2-ene and of some tristrifluoromethyl ethylenes
作者:Henry H. Evans、Roy Fields、Robert N. Haszeldine、Michael Illingworth
DOI:10.1039/p19730000649
日期:——
single-stage preparation of perfluoro-2,3-dimethylbut-2-ene involves the high-temperature reaction of trifluoroiodomethane with perfluorobut-2-yne. Hexafluoro-2-iodo-3-trifluoromethylbut-2-ene, formed at lower temperature from the butyne and trifluoroiodomethane, gives perfluoro-2-methylbut-2-ene by reaction with fluoride ion, and 2H-perfluoro-3-methylbut-2-ene by reduction with zinc and hydrochloric
fluorine acceptor which defluorinates perfluoroalkanes with the partial structure (Rf)2CFCF(Rf)2 to alkenes and perfluoroalkenes to dienes. Carbon catalyzes double-bond shifts, as well as cis/trans and ring-chain perfluoro-olefin isomerizations. Carbon effectively catalyzes TFE and HFP dimerizations. Less effectively, carbon catalyzes further oligomerization of TFE to give low yields of linear, internal olefins
Synthesis and some properties of silanes and siloxanes with 5,5,6,6,7,7,7-heptafluoro-4,4-bis(trifluoromethyl)heptyl substituents
作者:A. E. Shamaev、A. V. Ignatenko、S. P. Krukovsky
DOI:10.1007/s11172-005-0105-y
日期:2004.10
Methods for syntheses of new polyfluorinated compounds, viz., silanes containing substituents CF3CF2CF2C(CF3)2(CH2)3 (RF) at the silicon atom and 1,3,5-tris(RF)-1,3,5-trimethylcyclotrisiloxane that can be used for the synthesis of fluorocontaining oligo- and polysiloxanes of different structure, were developed. The polymerization of cyclotrisiloxane in the presence of 1,3-divinyltetramethyldisiloxane gave linear oligomers, whose chain contain -(RF)Si(Me)O- units.