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Issue 5, 2012
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Interaction of niobium and tantalum pentahalides with O-donors: coordination chemistry and activation reactions

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Abstract

The chemistry of niobium and tantalum pentahalides, MX5, with oxygen compounds is reviewed herein. The polynuclear structure of MX5 is readily broken by addition of oxygen-containing organic molecules, L, to give either mononuclear or ionic dinuclear coordination adducts. Then activation of the organic ligand may take place favoured by several factors, i.e. low M–X bond energy, high temperature, presence of more than one oxygen function within L, L/M molar ratio ≥ 2. The activation reactions are often uncommon in the context of metal halides; they include the cleavage of Csp3–O, Csp2–O, C–H and C–C bonds, and eventual successive rearrangements proceeding with C–O or C–C couplings. The recently elucidated reactivity of MX5 with limited amounts of oxygen compounds will be presented, and possible connections with the relevant MX5-directed syntheses reported in the literature will be outlined.

Graphical abstract: Interaction of niobium and tantalum pentahalides with O-donors: coordination chemistry and activation reactions

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Publication details

The article was received on 27 Jul 2011, accepted on 17 Oct 2011 and first published on 09 Nov 2011


Article type: Feature Article
DOI: 10.1039/C1CC14592D
Chem. Commun., 2012,48, 635-653

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    Interaction of niobium and tantalum pentahalides with O-donors: coordination chemistry and activation reactions

    F. Marchetti and G. Pampaloni, Chem. Commun., 2012, 48, 635
    DOI: 10.1039/C1CC14592D

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