Basf Aktiengesellschaft

Stefan Mansel

Franz Langhauser

Hans-Herbert Brintzinger

Jurgen Kerth

Gunther Schweier

Werner Roell

G Unther Schweier

J Urgen Kerth

Robin Kirsten

Cyclopentadineyl compounds of the formula II ##STR1## and formula III ##STR2## their preparation and their use as intermediates in the preparation of metallocene complexes of the formula I.

Racemic metallocene complexes and their preparation

Metallocene complexes of the formula I ##STR1## where M is titanium, zirconium, hafnium, vanadium, niobium or tantalum,

Polymers of C.sub.2 -C.sub.10 -alk-1-enes are prepared at from 0.5 to 3000 bar and from -50.degree. to 300.degree. C. using a catalyst system by a process in which the catalyst system used is one which contains, as active components: a) a metallocene complex of the general formula I ##STR1## where M is titanium, zirconium, hafnium, vanadium, niobium or tantalum, X is fluorine, chlorine, bromine, iodine, hydrogen, C.sub.1 -C.sub.10 -alkyl, C.sub.6 -C.sub.15 -aryl or --OR.sup.7,

Preparation of polymers of C.sub.2 -C.sub.10 -alk-1-enes using racemic

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Konstanz, Germany

Stefan Mansel