Process for the preparation of biaryls

US5451703A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Thomas Schach · Gernsheim, DE
• Theodor Papenfuhs · Frankfurt, DE
• Joachim Hackenbruch · Ginsheim-Gustavsburg, DE

Key dates

• Filing date: May 31, 1994
• Grant date: Sep 19, 1995
• Expiry date: May 31, 2014

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C17/269
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Process for the preparation of biaryls of the formula (1) EQU R.sup.1.sub.m --Ar--Ar--R.sup.1.sub.m (1) wherein Ar is a phenylene or naphthylene radical, R.sup.1 is a hydrogen, fluorine or chlorine atom or an unbranched or branched alkyl(C.sub.1 -C.sub.6)--, alkyl(C.sub.1 -C.sub.6)--O--, alkyl(C.sub.1 -C.sub.6)--CO-- or alkyl(C.sub.1 -C.sub.6)--SO.sub.2 -- radical and m is the number of still unsubstituted ##STR1## positions on the Ar radical, in which a compound of the formula (2) EQU R.sup.1.sub.m --Ar--X (2) wherein Ar, R.sup.1 and m have the meanings cited above and X is a chlorine or bromine atom, is dehalogenated and dimerized in the presence of a palladium catalyst on a support material, of a reducing agent, a hydrogen halide acceptor, a polyether or polyether mixture and of water at temperatures of about 50.degree. to about 120.degree. C.