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Issue 23, 2009
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Bis-hydroxylaminato group 4 half-sandwich complexes—syntheses, structures and polymerisation activity studies

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Abstract

The methylene- and ethylene-bridged bis-hydroxylamines HONMe(CH2)nNMeOH (n = 1, 2) were reacted with [Cp*TiCl3], [Cp*ZrCl3] and [Cp*HfCl3] in the presence of MeLi to give the complexes [Cp*TiMe{(η2-ONMe)2CH2}] (1), [Cp*TiMe{(η2-ONMeCH2)2}] (2), [Cp*ZrMe{(η2-ONMeCH2)2}] (3) and [Cp*HfMe{(η2-ONMeCH2)2}] (4). The reaction of 2 with AlMe3 afforded the adduct [Cp*TiMe{η2-[O(AlMe3)NMe]CH2CH22-(NMeO)}] (2·AlMe3). 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 η2-manner to the organometallic [Cp*MMe] complex fragments. The polymerisation reactions of ethylene and propylene catalysed by 2 activated with methylalumoxane (MAO) were examined.

Graphical abstract: Bis-hydroxylaminato group 4 half-sandwich complexes—syntheses, structures and polymerisation activity studies

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Publication details

The article was received on 04 Dec 2008, accepted on 13 Mar 2009 and first published on 07 Apr 2009


Article type: Paper
DOI: 10.1039/B821786F
Dalton Trans., 2009, 4473-4480

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    Bis-hydroxylaminato group 4 half-sandwich complexes—syntheses, structures and polymerisation activity studies

    A. Willner, J. Niemeyer and N. W. Mitzel, Dalton Trans., 2009, 4473
    DOI: 10.1039/B821786F

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