A by-product from the reaction of pentafluorobenzonitrile or hexafluorobenzene with sodium cyanide in methanol has been identified as 1,4-dicyano-2,3,5,6-tetramethoxybenzene. Its formation from hexafluorobenzene involves the displacement of all six fluorine atoms.
B. J. Wakefield, J. Chem. Soc. C, 1967, 72 DOI: 10.1039/J39670000072
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