Unbridged cyclopentadienyl-fluorenyl complexes of zirconium as catalysts for homogeneous olefin polymerization

Article abstract of DOI:10.1016/0022-328X(95)05640-B

The reaction of various lithium fluorenyl compounds, Li(C13H7R¹R²) (R¹R²=H, alkyl or aryl) (1a-1n), with C5H5ZrCl3 leads to unbridged fluorenyl complexes of the type (C5H5)C13H7R¹R²)ZrCl2 (2a-2n) which can be converted to the corresponding metallocene dimethyl complexes (3a-3e).In combination with methylaluminoxane (MAO), 2a-2n show a higher catalytic activity as homogeneous eethylene polymerization catalysts than (C5H5)2ZrCl2.Compound 2d (R¹=2-Me; R²=7-Me) was charcterized by an X-ray structure analysis.Keywords: Metallocene; Fluorenyl ligands; Olefin polymerization; Zirconium