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Issue 6, 2004
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Synthesis and structure of boron-bridged constrained geometry complexes of titanium

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Abstract

The boron-bridged constrained geometry titanium complexes [Ti{η51-(C5H4)B(NR2)NPh}(NMe2)2] [R = iPr (3), SiMe3 (4)] and [Ti{η51-(C9H6)B(NiPr2)NPh}(NMe2)2] (12) have been prepared in good yields by amine elimination reaction from [Ti(NMe2)4]. Subsequent deamination–chlorination with excess Me3SiCl yielded the corresponding dichloro-complexes (5, 6, 13). Reaction of the analogous ligand precursors (C5H5)B(NiPr2)N(H)R (R = Cy, tBu) with [Ti(NMe2)4] did not result in the expected bridged compounds, but rather in the half-sandwich complexes [Ti{(η5-C5H4)B(NiPr2)N(H)R}(NMe2)3] [R = Cy (9), tBu (10)]. All compounds were fully characterised by means of multinuclear NMR spectroscopy. Thorough investigation of substituent effects was achieved by comparative X-ray diffraction studies on complexes 3, 5, 6 and 12.

Graphical abstract: Synthesis and structure of boron-bridged constrained geometry complexes of titanium

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Publication details

The article was received on 03 Dec 2003, accepted on 05 Feb 2004 and first published on 13 Feb 2004


Article type: Paper
DOI: 10.1039/B315708C
Citation: Dalton Trans., 2004,0, 938-943

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    Synthesis and structure of boron-bridged constrained geometry complexes of titanium

    H. Braunschweig, F. M. Breitling, C. V. Koblinski, A. J. P. White and D. J. Williams, Dalton Trans., 2004, 0, 938
    DOI: 10.1039/B315708C

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