A Facile Synthesis of Perfluoro- and ω-Chloroperfluoro-1-pentafluorophenyl-1-alkynes
作者:Yanchang Shen、Weiming Qiu
DOI:10.1055/s-1987-27835
日期:——
Perfluoro-1-pentafluorophenyl-1-alkynes and the corresponding Ï-chloroperfluoro compounds are conveniently prepared by the following two-step sequence: Reaction of methylenetriphenylphosphorane with hexafluorobenzene followed by C-acylation of the resultant perfluorobenzylidenetriphenylphosphorane (without isolation) with perfluoroalkanoic anhydrides or Ï-chloroperfluoroalkanoyl fluorides, respectively, to give α-perfluoroacyl [or α-(Ï-chloroperfluoroacyl)]-perfluorobenzylidenetriphenylphosphoranes and pyrolysis of these latter compounds at 230-260°C/2 torr. The second step of the sequence represents an intramolecular Wittig reaction.