Bis(η-cyclopentadienyl)imido compounds of niobium

Abstract
The compound [Nb(η-C5H5)2(NBut)Cl] has been synthesised and its crystal structure determined. It is the precursor for the new compounds [Nb(η-C5H5)2(NBut)Me], [Nb(η-C5H5)2(NBut)Br], [Nb(η-C5H5)2(NBut)(C6H5CH2)] and [Nb(η-C5H5)2(NBut)(σ-C3H5)], and the hydrido derivative [Nb(η-C5H5)2(NBut)H].

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