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AssigneeHoechst Aktiengesellschaft
InventorsDieter Reuschling, Jurgen Rohrmann, Gerhard Erker, Reiner Nolte, Michael Aulbach, Astrid Weiss
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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, R.sup.2, R.sup.3 and R.sup.4, in addition to hydrogen, have the meanings given under R.sup.1 and 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.
A process for the preparation of a compound of the formula I or an isomer thereof of the formula Ia ##STR7## in which R.sup.1 is (C.sub.1 -C.sub.20)alkyl, (C.sub.6 -C.sub.14)aryl, (C.sub.1 -C.sub.10)alkyoxy, (C.sub.2 -C.sub.10)alkenyl, (C.sub.7 -C.sub.20)arylalkyl, (C.sub.7 -C.sub.20)alkylaryl, (C.sub.6 -C.sub.10)aryloxy, (C.sub.1 -C.sub.10)-fluoroalkyl, (C.sub.6 -C.sub.10)halogenoaryl, (C.sub.2 -C.sub.10)-alkynyl, a radical --SiR.sup.6.sub.3 or a heteroaromatic radical having 5 or 6 ring members, which can contain one or more hetero atoms,
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