| http://www.w3.org/ns/prov#value | - Further suitable organic transition metal compounds B) are metallocenes having at least one ligand formed from a cyclopentadienyl or heterocyclopentadienyl and a fused-on heterocycle, where, in the heterocycles, at least one carbon atom is replaced by a heteroatom, preferably from group 15 or 16 of the Periodic Table and in particular nitrogen or sulfur.
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