Patent ID: 7247733

Claim:
A process for preparing nuclear-fluorinated aromatics comprising reacting, at 40 to 260° C., (1) an aromatic compound substituted at the nucleus with halogen that is exchangeable for fluorine, with (2) a fluoride, in the presence of (3) at least one compound of the formula (I), where A is a radical of the formula (II) or (III) and B independently of A is a radical of the formula (II), (III), (IV), or (IVa) where the individual R 1 are identical or different and are each unbranched or branched C 1 -C 10 alkyl, unbranched or branched C 2 -C 10 alkylene, or C 6 -C 12 aryl, where one or more NR 1 R 1 groups can also be a 3- to 7-membered saturated or unsaturated ring that is formed from a nitrogen atom, the remainder of the ring atoms being carbon atoms, and where the radical of the formula (II) and the group in formula (IV) can also be the radical of a saturated or unsaturated 4- to 8-membered ring that contains two nitrogen atoms, the remainder of the ring atoms being carbon atoms, X is nitrogen or phosphorus, and An ⊖ is one equivalent of an anion.