Pentachlorobenzonitrile reacts with anhydrous potassium fluoride at 300–480° to give pentafluorobenzonitrile, 3-chlorotetrafluorobenzonitrile, and 3,5-dichlorotrifluorobenzonitrile. A 70% yield of pentafluorobenzonitrile is obtained at 350°.
J. M. Birchall, R. N. Haszeldine and M. E. Jones, J. Chem. Soc. C, 1971, 1341 DOI: 10.1039/J39710001341
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