title: Zirconocene complexes bearing novel 3-dimethylamino-1,2-dihydropentalene derived ligand systems.
abstract: Coupling of the N,N-dimethylacrylamides 6a-c with cyclopentadienide resulted in the formation of the substituted 3-dimethylamino-1,2-dihydropentalnenes 2a-c. Deprotonation followed by metallation with CpZrCl(3)·DME gave the substituted zirconocenes 12a-c. The reaction of 3-dimethylamino-1-methyl-dihydropentalene 2a with ZrCl(2)(NMe(2))(2)·2THF resulted in a unique coupling between a pair of the aminodihydropentalene derivatives to yield an unsymmetrically bridged novel ansa-zirconocene framework (9a). Treatment of the 1,1-dimethyl-substituted substrate 2b with this Zr-amido reagent in contrast resulted in a clean deprotonation and formation of the unbridged bis(dimethylaminohydropentalenyl)ZrCl(2) complexes 10b. The compounds 2a, 9a, meso-10b, 12a and 12c were characterized by X-ray diffraction.
authors.affiliation: Organisch-Chemisches Institut der Universität Münster, Corrensstrasse 40, 48149, Münster, Germany.
authors.forename: Bao-Hua
authors.initials: BH
authors.lastname: Xu
authors.forename: Gerald
authors.initials: G
authors.lastname: Kehr
authors.forename: Roland
authors.initials: R
authors.lastname: Fröhlich
authors.forename: Elisa
authors.initials: E
authors.lastname: Nauha
authors.forename: Gerhard
authors.initials: G
authors.lastname: Erker