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Synthesis and reactivity of alkynyl niobocene complexes

Authors:	Antonio Antiolo Cristina García-Yebra Mariano Fajardo Isabel del Hierro Carmen Lpez-Mardomingo Isabel Lpez-Solera Antonio Otero Yolanda Prez Sanjiv Prashar

Institution:	^a Departamento de Química Inorgánica, Orgánica y Bioquímica, Universidad de Castilla-La Mancha, Facultad de Químicas, Campus Universitario, 13071, Ciudad Real, Spain ^b Departamento de Tecnología Química, Ambiental y de los Materiales, E.S.C.E.T., Universidad Rey Juan Carlos, 28933 Mostoles, Madrid, Spain ^c Departamento de Química Orgánica, Campus Universitario, Universidad de Alcalá, 28871 Alcala de Henares, Madrid, Spain

Abstract:	The synthesis of alkynyl containing niobocene complexes with differing auxiliary ligands is described. The niobium(III) derivatives of the general formula Nb(η⁵-C₅H₄SiMe₃)₂(CCR)(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(=NR′)(η⁵-C₅H₄R″)₂(CCR)], were prepared. The characterization of these complexes is discussed. The reactivity of the alkynyl compounds towards oxidation and protonation has been studied.

Keywords:	Alkynyl Niobocene Protonation Imido Vinylidene
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