[2]Borametallocenophanes of Zr and Hf: synthesis, structure, and polymerization activity.
The first [2]borametallocenophanes of Zr and Hf are reported, which were obtained from 1,2-bis(dimethylamino)-1,2-dicyclopentadienyldiborane(4). The constitution of these complexes in solution and, for the Hf complex, in the crystalline state is discussed. The title complexes were studied as Ziegler-Natta-type catalyst precursors for the polymerization of ethylene. Both complexes produced PE of high molecular mass up to 1.6 x 106 g/mol, and very interestingly, the Hf complex proved to be as active as its Zr analogue.
Braunschweig
Holger
H
Institut für Anorganische Chemie, Bayerische Julius-Maximillians Universität Würzburg, Am Hubland, 97074 Würzburg, Germany. h.braunschweig@mail.uni-wuerzburg.de
Gross
Manuela
M
Kraft
Mario
M
Kristen
Marc O
MO
Leusser
Dirk
D