Process for the preparation of substituted indenes

US5194619A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Dieter Reuschling · Rockenberg, DE
• Jurgen Rohrmann · Kelkheim, DE
• Gerhard Erker · Münster, DE
• Reiner Nolte · Ludwigshafen, DE
• Michael Aulbach · Hofheim, DE
• Astrid Weiss · Munster, DE

Key dates

• Filing date: Feb 14, 1992
• Grant date: Mar 16, 1993
• Expiry date: Feb 14, 2012

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C2602/08
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The compounds of the formula I or Ia ##STR1## in which R.sup.1 is alkyl, aryl, alkoxy, alkenyl, arylalkyl, alkylaryl, aryloxy, fluoroalkyl, halogenoaryl, alkynyl, trialkylsilyl or a heteroaromatic radical, PA0 R.sup.2, R.sup.3 and R.sup.4, in addition to hydrogen, have the meanings given under R.sup.1 and PA0 R.sup.5 is hydrogen, alkyl, fluoroalkyl or alkenyl, can be obtained in a one-stage process by reaction of a compound II ##STR2## with (substituted) cyclopentadiene in the presence of a base. The compounds I and Ia are suitable as ligands for metallocene complexes which are used as catalysts in olefin polymerization.