Preparation of indene derivatives

US6087536A · kind A · utility

Assignee

• BASF SE

Inventors

• Hans-Joachim Muller · Remscheid, DE
• Peter Trubenbach · Ludwigshafen, DE
• Bernhard Rieger · Langenau, DE
• Jurgen Wagner · Bottmingen, CH
• Ulf Dietrich · Bad Kötzting, DE

Key dates

• Filing date: Aug 22, 1997
• Grant date: Jul 11, 2000
• Expiry date: Aug 22, 2017

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C2603/12
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for preparing indene derivatives of the general formula I ##STR1## where R.sup.1 is a C.sub.1 -C.sub.10 -alkyl radical, a phenyl radical or a C.sub.1 -C.sub.4 -alkyl-substituted phenyl radical and PA1 A is a bridge which, together with the adjacent carbons, forms a six-membered aromatic or a five- or six-membered heteroaromatic or carbocyclic ring onto which a further aromatic ring may be fused, comprises reacting II with III ##STR2## (X=chlorine, bromine, iodine) in the presence of a Friedel-Crafts catalyst to give IV ##STR3## which is then dehydrogenated to I.