A well-defined silica-supported dinuclear tungsten(III) amido species: synthesis, characterization and reactivity.
ABSTRACT Grafting of [W(2)(NMe(2))(6)] onto dehydroxylated silica affords the well-defined surface species [([triple bond, length as m-dash]Si-O)W(2)(NMe(2))(5)], characterized by elemental analysis, and infrared, Raman and NMR spectroscopies, and the catalytic reactivity of this supported tungsten(III) d(3)-d(3) dimer and of its alkoxide derivatives towards alkynes has been probed.
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ABSTRACT: A new dimeric tungsten(III) complex containing amidoand chelating pyridine–alkoxido ligands was synthesized through protonolysis of [W2(NMe2)6] by 2-(2-pyridyl)propan-2-ol and fully characterized by X-ray diffraction and infrared and NMR spectroscopy. Intramolecular exchange processes were studied by variable-temperature NMR spectroscopy. The compound was grafted onto dehydroxylated silica by protonolysis of an amido–tungsten bond, and the structure of the supported species was investigated by infrared and solid-state (bidimensional) NMR spectroscopy. The reactivity of the molecular and grafted species toward alkynes was probed. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)Berichte der deutschen chemischen Gesellschaft 10/2007; 2007(35):5541 - 5547. · 2.94 Impact Factor