Preparation of hexaarylbisimidazoles

US4866183A · kind A · utility

Assignee

• BASF SE

Inventors

• Uwe Kempe · Schifferstadt, DE
• Toni Dockner
• Helmut Karn · Ludwigshafen, DE
• Thomas Bluemel · Erpolzheim, DE
• Reinhold J. Leyrer · Schifferstadt, DE
• Thomas Loerzer · Bischofswerda, DE

Key dates

• Filing date: Jun 9, 1987
• Grant date: Sep 12, 1989
• Expiry date: Jun 9, 2007

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D233/64
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Hexaarylbisimidazoles I ##STR1## where Ar.sup.1, Ar.sup.2 and Ar.sup.3 are each aryl, of which Ar.sup.2 and Ar.sup.3 can be linked to form an anellated ring system, are prepared by oxidizing the corresponding triarylimidazoles II in an aqueous/organic two-phase system in the presence of active amounts of an onium salt III.