[2]Borametallocenophanes of Zr and Hf: synthesis, structure, and polymerization activity

Holger Braunschweig; Manuela Gross; Mario Kraft; Marc O Kristen; Dirk Leusser

doi:10.1021/ja042408s

[2]Borametallocenophanes of Zr and Hf: synthesis, structure, and polymerization activity

J Am Chem Soc. 2005 Mar 16;127(10):3282-3. doi: 10.1021/ja042408s.

Authors

Holger Braunschweig¹, Manuela Gross, Mario Kraft, Marc O Kristen, Dirk Leusser

Affiliation

¹ Institut für Anorganische Chemie, Bayerische Julius-Maximillians Universität Würzburg, Am Hubland, 97074 Würzburg, Germany. h.braunschweig@mail.uni-wuerzburg.de

PMID: 15755137
DOI: 10.1021/ja042408s

Abstract

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.