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- W1969654310 abstract "Die durch Ni(CO)4 induzierte Offnung des Dreirings in Spiro[2.4]hepta-4,6-dien (1) wird durch Methyl- und Vinylsubstituenten dirigiert. Wahrend eine Methylgruppe in 1-Position die Offnung der benachbarten Dreiring-CC-Bindung hemmt, wird diese bei Anwesenheit einer Vinylgruppe bevorzugt geoffnet. Neben uberbruckten σ-Alkyl- oder σ-Acyl-π-cyclopentadienyl-Komplexen 2, 5, 6, 9 und 10 werden auch zweikernige Systeme 3 und 7 mit einem μ-[1,5-Di(1–5-η-cyclopenta-dienyl)-3-pentanon]-Liganden gebildet. Der Aufbau dieses Liganden durch carbonylierende Kupplung zweier ringgeoffneter Spiroheptadien-Einheiten verlauft uber die Anlagerung eines Spiroheptadiens an den Acylkomplex 2 und uber das Nickelocenophanon 14.Ring Opening and Carbonylation of the Spiro[2.4]hepta-4,6-diene System with TetracarbonylnickelNi(CO)4-induced opening of the three-membered ring in spiro[2.4]hepta-4,6-diene (1) is directed by methyl and vinyl substituents. While a methyl group in 1-position hinders the opening of the adjacent three-membered ring CC bond, a vinyl group enhances the opening of this bond. Besides bridged σ-alkyl- and σ-acyl-π-cyclopentadienyl complexes 2,5,6,9, and 10, dinuclear systems 3 and 7 are also formed, containing a μ-[1,5-di(1–5-η-cyclopentadienyl)-3-pentanone] ligand. Formation of this ligand by carbonylation and coupling of two spiroheptadiene units occurs by coordination of a spiroheptadiene molecule to the acyl complex 2 via the nickelocenophanon 14." @default.
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- W1969654310 date "1980-04-01" @default.
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- W1969654310 title "Ringöffnende Carbonylierung des Spiro[2.4]hepta-4,6-dien-Systems mit Tetracarbonylnickel" @default.
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- W1969654310 doi "https://doi.org/10.1002/cber.19801130421" @default.
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