The sequential reaction of phosphonium salt 1 with n-butyllithium, hexafluorobenzene or chloropentafluorobenzene, hexanoyl chloride and triethylamine affords pentalfuorophenyl or chlorotetrafluorophenyl allenes in 82–95% yields.
Y. Shen and Z. Zhang, J. Chem. Res. (S), 1998, 602 DOI: 10.1039/A802939C
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