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- W2023896674 abstract "The primary reduction products in the Al/AlX3/NbX5/arene system, namely Nb(η6-arene)(AlX4)2, X = Cl, arene = benzene, hexamethylbenzene; X = Br, arene = hexamethylbenzene, have been isolated. Tetrahydrofuran at room temperature reacts with Nb(η6-hexamethylbenzene)(AlBr4)2, to give the aluminium-free complex Nb2(η6-hexamethylbenzene)2Br4, whose crystal structure was determined by X-ray diffraction methods. In the presence of tetrahydrofuran or dimethoxyethane, the η6-mesitylene-tetrahaloaluminato complexes are further reduced by aluminium to bis-mesityleneniobium(0), Nb(mes)2, which undergoes: a) disproportionation with CO to [Nb(mes)2(CO)]+ [Nb(CO)6]−, b) oxidation by V(CO)6 or (4,4′-dimethyl-2,2′-dipyridyl)(BPh4)2 under carbon monoxide to [Nb(mes)2(CO)]X, X = [V(CO)6]− or BPh4−. The structure of [Nb(mes)2(CO)] BPh4 has been determined by X-ray diffraction methods. In the presence of CO, Nb(mes)2 is reduced by CoCp☆2 [Cp☆ = η5-C5(CH3)5] to [Nb(CO)6]−, which was isolated as its CoCp☆2+ derivative; it efficiently deoxygenates CO2 to CO in the presence of carbon monoxide acceptors such as the [Nb(mes)2(THF)]+ cation." @default.
- W2023896674 created "2016-06-24" @default.
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- W2023896674 date "1991-08-01" @default.
- W2023896674 modified "2023-10-16" @default.
- W2023896674 title "Synthesis and reactivity of η6-arene derivatives of niobium(II), niobium(I), and niobium(O)" @default.
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- W2023896674 doi "https://doi.org/10.1016/0022-328x(91)80041-h" @default.
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