Preparation and structural characterization of chloro- and alkyl-isocyanidoniobocene compounds. Synthesis of the 1st dicyclopentadienylniobium species containing iminoacyl groups
Identificadores
Enlace permanente (URI): http://hdl.handle.net/10017/4651DOI: 10.1016/0022-328X(88)80074-3
ISSN: 0022-328X
Editor
Elsevier
Fecha de publicación
1988Cita bibliográfica
Journal of Organometallic Chemistry, 1988, v.340, n.2, p.187-193
Palabras clave
Niobocene complexes
Iminoacyl groups
Proyectos
2001-83 (Ministerio de Educación y Ciencia)
Tipo de documento
info:eu-repo/semantics/article
Versión
info:eu-repo/semantics/publishedVersion
Versión del editor
http://dx.doi.org/10.1016/0022-328X(88)80074-3Derechos
© Elsevier, 1988
Derechos de acceso
info:eu-repo/semantics/openAccess
Resumen
The reduction of the niobocene complexes Nb(η5-C5H3RR′)2Cl2 (R = H, R′ = SiMe3 (I); R = R′ = SiMe3 (II)) with one equivalent of (1%) sodium amalgam in the presence of an isocyanide ligand R″NC yields Nb(η5-5H3RR′)2Cl(CNR″) (R = H, R′ = SiMe3, R″ = Cy = cyclohexyl (III); tBu (IV); Ph (V); 2,6-Me2C6H3 (VI), and R = R′ = SiMe3, R″ = Cy (VII), tBu (VIII)). Reactions of III and V with LiMe and LiCH2SiMe3 give the thermally stable iminoacyl compounds [Nb(η5-C5H4SiMe3)2-(CRNR′)]n(R = Me, R′ = Cy (IX); R = CH2SiMe3, R′ = Cy (X) and R = Me, R′ = Ph (XII)), through spontaneous insertion of the isocyanide ligand into the alkyl-niobium bond. Insertion of t-BuNC into the metal-alkyl bond in IV was not observed, and only the alkyl isocyanide derivative Nb(η5-C5H4SiMe3)2(Me)(CNtBu) (XI) was isolated. The compounds were characterized by IR and NMR spectroscopy.
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