Synthesis and Reactivity of Monocyclopentadienyltantalum(V) Siloxide Complexes

• Published in: European Journal of Inorganic Chemistry Vol. 2008; no. 19; pp. 3062 - 3067
• Main Authors: Conde, Ana, Fandos, Rosa, Otero, Antonio, Rodríguez, Ana, Terreros, Pilar
• Format: Book Review Journal Article
• Language: English
• Published: Weinheim WILEY-VCH Verlag 01.07.2008; WILEY‐VCH Verlag; Wiley
• Subjects: Chemistry; Chemistry, Inorganic & Nuclear; Cyclopentadienyl ligands; Physical Sciences; Science & Technology; Silicon; Tantalum; OLEFIN POLYMERIZATION CATALYSTS; EPOXIDATION CATALYSTS; ACTIVE-SITES; CRYSTAL-STRUCTURES; SILSESQUIOXANE COMPLEXES; ETHYLENE POLYMERIZATION; silicon; MOLECULAR-STRUCTURES; cyclopentadienyl ligands; TERT-BUTYL ISOCYANIDE; tantalum; CARBON-MONOXIDE REDUCTION; SOLUBLE MODEL SYSTEMS
• ISSN: 1434-1948; 1099-0682
• DOI: 10.1002/ejic.200800229

The new tantalum siloxide complex [TaCp*Me3(OSiPh3)] (1; Cp* = η5‐C5Me5) has been synthesized. The reaction of complex 1 with isocyanides yields the respective azatantalacyclopropanes [TaCp*(η2‐Me2CNxylyl)Me(OSiPh3)] (2; xylyl = 2,6‐dimethylphenyl) and [TaCp*(η2‐Me2CNtBu)Me(OSiPh3)] (3). The molecular structure of complex 2 has been established by X‐ray diffraction. Complex 2 reacts with a second mol‐equiv. of 2,6‐xylyl isocyanide to yield [TaCp*(Nxylyl)[N(xylyl)CMe=CMe2)(OSiPh3)] (4). The reaction of 1 with carbon monoxide gives [TaCp*(O)(OCMe=CMe2)(OSiPh3)] (5), whereas 1 reacts with B(C6F5)3 to give the corresponding cationic compound [TaCp*Me2(OSiPh3)][MeB(C6F5)3] (6). (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008) We report the reactivity of tantalum complexes containing a siloxide group as anancillary ligand with several unsaturated organic molecules such as isocyanides or carbon monoxide.