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    Please use this identifier to cite or link to this item: http://asiair.asia.edu.tw/ir/handle/310904400/17244

    Title: Some reactions of gem-dibromocyclopropanes and metal carbonyls
    Authors: Shaw-Tao Lin;Chuan-Chen Lee;Mei-Fang Ding;David W. Liang;An-Ting Jeng
    Contributors: 保健營養生技學系
    Keywords: gem-Dibromocyclopropane;Chromium carbonyl;Debromination;Ring-opening;coupling
    Date: 2011-01
    Issue Date: 2012-11-26 10:30:29 (UTC+8)
    Abstract: "A series of gem-dibromocyclopropanes were treated with various metal complexes. Among the metal
    complexes, Ru(CO)2(PPh3)
    3, Ru(CO)3(PPh3)
    2, and Mo(CO)6
    were able to remove a bromine atom from
    1,1-dibromo-2-phenylcyclopropanes (1) to yield a series of corresponding of 1-bromo-2-phenylcyclopropanes (2). Upon the treatment of 1 with Cr(CO)6 in DMSO, a series of allenes were obtained in good
    yields. The correlation between the rate of formation of allenes and the substituents on the benzene gives a
    negative coefficient which suggests the dibromocyclopropanes possesses as an electrophile toward to
    Cr(CO)6. In the presence of Cr(CO)6, gem-dibromobicyclo[n,1,0]alkanes (4) in DMF or DMSO solution
    underwent the cleavage of carbon-bromine bond followed by ring-expansion and coupling reaction to
    form bicycloalkenes 7"
    Appears in Collections:[食品營養與保健生技學系] 期刊論文

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