Manufacture of substituted fluorobenzenes
AssigneeBASF SE
InventorsHeinz-Guenter Oeser, Karl-Heinz Koenig, Dietrich Mangold
Life of this patent
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Abstract
Fluorobenzenes are manufactured by reacting substituted chlorobenzenes with potassium fluoride in the presence of catalytic amounts of cesium fluoride and in the presence of certain solvents; m-nitrofluorobenzenes and m-cyanofluorobenzenes can also be manufactured in the absence of cesium fluoride. The products are starting materials for the manufacture of dyes, pharmaceuticals and pesticides.
Claims9
A process for the manufacture of a substituted fluorobenzene of the formula ##STR6## where R.sup.1 is nitro or cyano and R.sup.2 is hydrogen, an aliphatic radical or halogen, by reacting a substituted chlorobenzene of the formula ##STR7## where R.sup.1 and R.sup.2 have the above meanings, with potassium fluoride in the presence of a solvent and in the presence of from 0.001 to 0.1 mole of cesium fluoride per mole of starting material II, or in the absence of cesium fluoride and in the presence of an N,N-disubstituted carboxylic acid amide, nitrobenzene, nitrile, aliphatic sulfone and/or aliphatic sulfoxide as the solvent.
Dependencies are inferred from the claim text.