Novel fluorinated mono-enes and di-enes have been synthesised via telomerisation reactions using (CF3)2CFI with CF2CH2 and also with CF2CFH. Cyclo-additions with diazomethane occur readily to give Δ1 or Δ2 pyrazolines, depending on the system, and nucleophilic attack occurs with methanol and with fluoride ion. In the latter case, stable carbanions have been observed. A novel free-radical route to
give information relating to mechanism of cross-linking of the polymer and indications of factors that limit its working life. Novel use of SbF5 for dehydrofluorination in synthesis of fluorinated mono-enes and di-enes is described.
Antimony pentafluoride in the synthesis of novel fluoro-alkene derivatives and a novel approach to conjugated polymers
作者:Richard D. Chambers、Martin Salisbury、Glenn Apsey、Thomas F. Holmes、Silvana Modena
DOI:10.1039/c39880000679
日期:——
Elimination of hydrogen fluoride, using antimonypentafluoride, is a useful preparative process for some fluorinated alkenes and presents a new and simple approach to conjugatedpolymers.
使用五氟化锑消除氟化氢是一些氟化烯烃的有用制备方法,它为共轭聚合物提供了一种新的简单方法。
Fluoro-alkene forming eliminations using antimony pentafluoride
作者:Glenn C. Apsey、Richard D. Chambers、Paolo Odello
DOI:10.1016/0022-1139(96)03389-1
日期:1996.4
Reactions involving perfluoro-2-iodopropane and 1,1-difluoroethene, give telomers (1) and these telomeriodides are coupled to give [(CF3)2CF(CH2CF2)n−]2 (2). Fluorodeiodination gives a series of compounds (CF3)2CF(CH2CF2)nF (3). Lewis acid-induced eliminations from these systems is very effective using SbF5 and cyclisations can also be induced by this methodology. A series of conjugated polymers is
716. Addition of free radicals to unsaturated systems. Part V. The direction of addition to 1 : 1-difluoroprop-1-ene, 3 : 3 : 3-trifluoro-2-trifluoromethylprop-1-ene, and 3-chloro-3 : 3-difluoro-2-trifluoromethylprop-1-ene