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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 117 (1984), S. 344-354 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Photochemical Reactions of Transition Metal Olefin Complexes, 8. Photochemical Addition of 6-Substituted Pentafulvenes to Tricarbonyl(η6-8,8-dimethylheptafulvene)chromium(0)Under photochemical conditions 6-substituted pentafulvenes (2a - d) displace one CO ligand from tricarbonyl(η6-8,8-dimethylheptafulvene)chromium(0) (1) with formation of a C - C bond between C-6 of a fulvene and C-1 of the heptafulvene ligand leading to substituted dicarbonyl-[η5:3-(cyclopentadienediyl)(isopropylidenecycloheptadienediyl)methane]chromium complexes (3a - 5c). In all cases two diastereomeric complexes are formed, which are separated by column chromatography. They differ in the location of the η3-enyl systems. In 3a, d the enyl system encompasses C-1′ to C-3′, in 4a, b, d C-1′, C-7′, and C-8′, and in 5b, c C-3′ to C-5′ in the isopropylidenecycloheptadienediyl residue. The structures of the complexes 3a - 5c were derived from the spectra.
    Notes: 6-Substituierte Pentafulvene (2a - d) verdrängen unter photochemischen Bedingungen aus Tricarbonyl(η6-8,8-dimethylheptafulven)chrom(0) (1) einen CO-Liganden unter Ausbildung einer C - C-Bindung zwischen C-6 eines Fulvens und C-1 des Heptafulven-Liganden. Es resultieren substituierte Dicarbonyl[η5:3-(cyclopentadiendiyl)(isopropylidencycloheptadiendiyl)methan]-chrom-Komplexe (3a - 5c), und zwar stets in zwei Diastereomeren, die sich säulenchromatographische trennen lassen. Sie unterscheiden sich in der Stellung des η3-Enyl-Systems. In 3a, d umfaßt das Enyl-System C-1′ bis C-3′, in 4a, b, d C-1′, C-7′ und C-8′ und in 5b, c C-3′ bis C-5′ im Isopropylidencycloheptadiendiyl-Rest. Die Konstitutionsformeln von 3a - 5c wurden spektroskopisch abgeleitet.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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