Synthesis and reactivity of alkynyl niobocene complexes (original) (raw)

2003, Journal of Organometallic Chemistry

The synthesis of alkynyl containing niobocene complexes with differing auxiliary ligands is described. The niobium(III) derivatives of the general formula [Nb(h 5 -C 5 H 4 SiMe 3 ) 2 (C Å/CR)(L)] where L is either carbonyl, phosphine, phosphite, or isocyanide, were prepared by the reaction of the bis(alkynyl)magnesium reagent with the corresponding cloro-niobocene precursor. In a similar manner the niobium(V) imido compounds, of the general formula, [Nb( Ä/NR?)(h 5 -C 5 H 4 Rƒ) 2 (CÅ/CR)], were prepared. The characterization of these complexes is discussed. The reactivity of the alkynyl compounds towards oxidation and protonation has been studied. #

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