Hoechst Aktiengesellschaft

Joachim Hackenbruch

Theodor Papenfuhs

Gunter Siegemund

Arnold Schneller

Ralf Pfirmann

Thomas Schach

Klaus Warning

Process for the preparation of biaryls of the formula (1)

Process for the preparation of biaryls

Process for producing 2,3-difluoro-6-nitrophenol

Process for the preparation of 1,4-bis(4-hydroxybenzoyl)benzene

Process for the preparation of 1,4-bis(4-hydroxybenzoyl)-benzene

A process for the preparation of halogen-containing aromatic compounds of the formula ##STR1## wherein Hal represents fluorine, chlorine or bromine and Z represents an aromatic group which comprises reacting a halobenzene of the formula C.sub.6 H.sub.5 Hal (II) under anhydrous conditions with a halide of a bisacid having the formula Hal-CO-Z-CO-Hal (III) in a molar ratio of at least 2:1 in the presence of a haloalkane sulfonic acid of the formula Y(C.sub.n X.sub.2n)SO.sub.3 H (IV), in formulae II and III Hal and Z having the afore-mentioned meaning and Y representing fluorine or hydrogen, X at least one of fluorine and chlorine, but at least one X being fluorine, and n being an integer of from 1 to 10. The said bis-(4-halobenzoyl) compounds being useful monomers for chemically resistant plastics which are still resistant even at high temperatures.

Process for the preparation of halogen-containing aromatic compounds

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Mainz, Germany

Joachim Hackenbruch