title: Bis-hydroxylaminato group 4 half-sandwich complexes-syntheses, structures and polymerisation activity studies.
abstract: The methylene- and ethylene-bridged bis-hydroxylamines HONMe(CH(2))(n)NMeOH (n = 1, 2) were reacted with [Cp*TiCl(3)], [Cp*ZrCl(3)] and [Cp*HfCl(3)] in the presence of MeLi to give the complexes [Cp*TiMe{(eta(2)-ONMe)(2)CH(2)}] (), [Cp*TiMe{(eta(2)-ONMeCH(2))(2)}] (), [Cp*ZrMe{(eta(2)-ONMeCH(2))(2)}] () and [Cp*HfMe{(eta(2)-ONMeCH(2))(2)}] (). The reaction of with AlMe(3) afforded the adduct [Cp*TiMe{eta(2)-[O(AlMe(3))NMe]CH(2)CH(2)-eta(2)-(NMeO)}] (.AlMe(3)). The compounds were characterised by NMR spectroscopy, elemental analyses and mass spectrometry. Their crystal structures were determined by X-ray diffraction. In each case, all four donor atoms of the [2 + 2]-dentate ligands coordinate in a eta(2)-manner to the organometallic [Cp*MMe] complex fragments. The polymerisation reactions of ethylene and propylene catalysed by activated with methylalumoxane (MAO) were examined.
authors.affiliation: Fakultät für Chemie, Anorganische Chemie und Strukturchemie, Universität Bielefeld, Universitätstrasse 25, 33615 Bielefeld, Germany.
authors.forename: Alexander
authors.initials: A
authors.lastname: Willner
authors.forename: Jochen
authors.initials: J
authors.lastname: Niemeyer
authors.forename: Norbert W
authors.initials: NW
authors.lastname: Mitzel