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    National Tsing Hua University Institutional Repository > 理學院 > 化學系 > 期刊論文 >  Reaction of tungsten eta(3)-anti-pentadienyl compounds with reactive olefins and isocyanates: [5+2] Cycloaddition versus acylation


    Please use this identifier to cite or link to this item: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/57694


    Title: Reaction of tungsten eta(3)-anti-pentadienyl compounds with reactive olefins and isocyanates: [5+2] Cycloaddition versus acylation
    Authors: Yueh TC;Lush SF;Lee GH;Peng SM;Liu RS
    教師: 劉瑞雄
    Date: 1996
    Publisher: American Chemical Society
    Relation: Organometallics,American Chemical Society,Volume: 15,Issue: 26,Pages: 5669-5673,Published: DEC 24 1996
    Keywords: CARBON BOND FORMATION
    PHOSPHINE CHEMISTRY
    PENTADIENYL LIGAND
    COMPLEXES
    MOLYBDENUM
    ZIRCONIUM
    Abstract: Sequential treatment of CpW(CO)(3)(CH2C=CCMe=CH2) (1) with CF3SO3H and MeOH in cold diethyl ether (-40 degrees C) gave a 75% yield of CpW(CO)(3)(eta(3)-anti-2-CO(2)Me-4-methylpentadienyl) (2). Compound 2 reacted with TCNE to afford the novel [5 + 2] cycloaddition adduct 3 in 62% yield; the molecular structure of 3 showed a 1,2-shift of the tungsten fragment, indicating a eta(4)-s-cis-diene reaction intermediate. The reaction of 2 with reactive isocyanates RN=C=O (R = PhSO(2), CH3C6H4SO2) in cold CH2Cl2 produced 4a (R = PhSO(2)) and 4b (R = CH3C6H4SO2) in 82% and 87% yields, respectively; the two compounds can be regarded as the acylation derivatives of 2, according to an X-ray diffraction study of 4a.
    URI: http://pubs.acs.org/
    http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/57694
    Appears in Collections:[化學系] 期刊論文

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