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• W1509809457 abstract "A large variety of (η5-borole)cobalt complexes have been prepared starting with η-(CO)2[Co(CO)(η5-C4H4BR)]2(CoCo) (IIIa: R = Me, IIIb: R = Ph), including inter alia, the sandwich complexes CpCo(η5-C4H4BR) (VIIa, b), the triple-decked complexes η-(η5-C4H4BR)[Co(η5-C4H4BR)]2 (VIIIa, b) and μ-(η5-C4H4BR)(FeCp)[Co(η5-C4H4BR)] (X, R = Ph), the dinuclear complex μ-(CO)2[Fe(CO)Cp][Co(CO)(η5-C4H4BPh)](FeCo) (IX), and salts M[Co(η5-C4H4BR)2](XVa, b: M = Na; XVIa, b: M = NMe4; XVII: M = Cs, R = Ph). The anions [Co(η5-C4H4BR)2]− readily undergo stacking reactions to form multiple-decked complexes such as the triple-decker compounds μ-(η5-C4H4BR)[Mn(CO)3][Co(η5-C4H4BR)] (XIIa, b), μ-(η5-C4H4BR)[Co(η5-C4H4BR)][Rh(η-1,5-COD)] (XVIII), [NMe3Ph][μ-η5-C4H4BPh){Cr(CO)3}{Co(η5-C4H4BPh)}] (XX), and the quadruple-decker complex Ru[μ-(η5-C4H4BR)Co(η5-C4H4BR)]2 (XXI). The monofacially bound η5-borole ligands in VIIb and VIIIb shows regiospecific H/D exchange, at the α position of the boron, on treatment with CF3CO2D at room temperature. VIIb undergoes a Friedel-Crafts substitution to give the 2-acetyl derivative XXIV with MeCoCl/SnCl4 in CH2Cl2 at room temperature. The structure of VIIIa, as determined by X-ray diffraction studies is that of a typical triple-decker compound with nearly coplanar rings. The three borole rings form a helix with torsional angles of 59.8 and 72.2°. All intra-ring bond distances of the central ligand are longer than those of the outer ligands. The metal-ligand interaction is somewhat stronger for the outer ligands than for the central ligand. Eine grosse Vielfalt von (η5-Borol)cobalt-Komplexen wurde ausgehend von μ-((CO)2[Co(CO)(η5-C4H4BR)]2(CoCo) (IIIa: R = Me, IIIb: R = Ph) dargestellt, darunter die Sandwich-Komplexe CpCo(η5-C4H4BR) (VIIa, b), die Tripeldeckerkomplexe μ-(η5-C4H4BR)[Co(η5-C4H4BR)]2 (VIIIa, b) und μ-(η5-C4H4BR)-(FeCp)[Co(η5-C4H4BR)] (X, R = Ph), der Zweikernkomplex μ-(CO)2[Fe(CO)Cp]Co(CO)(η5-C4H4BPh)](FeCo) (IX) und Salze M[Co(η5-C4H4BR)2] (XVa, b: M = Na; XVIa, b: M = NMe4; XVII: M = Cs, R = Ph). Die Anionen [Co(η5-C4H4BR)2]− lassen sich leicht unter Bildung von Multipeldeckerkomplexen aufstocken wie den Tripeldeckerverbindungen μ-(η5-C4H4BR)[Mn(CO)3][Co(η5-C4H4BR)] (XIIa, b), μ-(η5-C4H4BR)[Co(η5-C4H4BR)][Rh(η-1,5-COD)] (XVIII), [NMe3Ph][μ-(η5-C4H4BPh){Cr(CO)3}{Co(η5-C4H4BPh)}] (XX) und dem Quadrupeldeckerkomplex Ru[μ-(μ5-C4H4BR)-CO(η5-C4H4BR)]2 (XXI). Die monofacial gebundenen η5-Borol-Liganden in VIIb und VIIIb reagieren mit CF3CO2D bei Raumtemperatur unter regiospezifischem H/D-Austausch in der α-Position zum Bor. VIIb erleidet mit MeCOCl/SnCl4 in CH2Cl2 bei Raumtemperatur Friedel-Crafts-Substitution und ergibt das 2-Acetyl-Derivativ XXIV. Die Röntgenstrukturanalyse von VIIIa zeigt eine typische Tripeldeckerstruktur mit nahezu coplanaren Ringen. Die drei Borol-Ringe bilden eine Helix mit Torsionswinkeln von 59.8 und 72.2°. Alle Bindungslängen innerhalb des Rings des zentralen Liganden sind verlängert im Vergleich zu denen der äusseren Liganden. Die Metall-Ligand-Wechselwirkung ist etwas stärker für die äusseren Liganden als für den zentralen Liganden." @default.
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• W1509809457 date "1987-01-01" @default.
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• W1509809457 title "Derivate des borols" @default.
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