Preparation of substituted fluorobenzenes
AssigneeBASF SE
InventorsHeinz-Guenter Oeser, Karl-Heinz Koenig, Dietrich Mangold
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Abstract
A process for the preparation of substituted fluorobenzenes which contain a nitro group or a cyano group and may or may not contain an aliphatic radical or an additional halogen atom, wherein the corresponding substituted chlorobenzene is reacted with potassium fluoride in the presence of a crown ether and a solvent at from 150.degree. to 230.degree. C.
Claims3
A process for the preparation of a substituted fluorobenzene of the formula ##STR7## 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 ##STR8## where R.sup.1 and R.sup.2 have the above meanings, with potassium fluoride in the presence of a crown ether and in the presence of an N,N-disubstituted carboxylic acid amide, nitrobenzene, nitrile, aliphatic sulfone and/or aliphatic sulfoxide as solvent, said reaction being carried out at from 150.degree. to 230.degree. C.
Dependencies are inferred from the claim text.