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Issue 1, 2003
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Monocyclopentadienyl complexes of niobium, tantalum and tungsten containing heterodifunctional P,O ligands

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Abstract

The reactions of P,O type ligands with the half-sandwich complexes [(η-C5R5)MCl4] (R5 = H5, Me5, iPrH4; M = Nb, Ta, W) have been investigated. Monodentate P-adducts were obtained with the β-amidophosphine Ph2PCH2C(O)NPh2, whereas in the case of the keto ligand Ph2PCH2C(O)Ph a spontaneous HCl elimination occurred to give direct access to the corresponding phosphinoenolate complexes. The crystal structures of [(η-C5H5)Nb[upper bond 1 start]Cl3{PPh2CH[horiz bar, triple dot above]C([horiz bar, triple dot above]O[upper bond 1 end])Ph}], [(η-C5H5)Ta[upper bond 1 start]Cl3{PPh2CH[horiz bar, triple dot above]C([horiz bar, triple dot above]O[upper bond 1 end])Ph}] and [(η-C5Me5)Ta[upper bond 1 start]Cl3{PPh2CH[horiz bar, triple dot above]C([horiz bar, triple dot above]O[upper bond 1 end])Ph}] have been determined. Interestingly, the acetamido derived phosphine Ph2PNHC(O)Me afforded O-adducts, which is an unusual bonding mode for a P,O ligand.

Graphical abstract: Monocyclopentadienyl complexes of niobium, tantalum and tungsten containing heterodifunctional P,O ligands

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Publication details

The article was received on 21 Mar 2002, accepted on 27 May 2002 and first published on 13 Sep 2002


Article type: Paper
DOI: 10.1039/B202983A
New J. Chem., 2003,27, 32-38

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    Monocyclopentadienyl complexes of niobium, tantalum and tungsten containing heterodifunctional P,O ligands

    X. Morise, M. L. H. Green, P. Braunstein, L. H. Rees and I. C. Vei, New J. Chem., 2003, 27, 32
    DOI: 10.1039/B202983A

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