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    • 5. 发明授权
    • Process for producing alkenals and intermediates therefor
    • 生产枸杞子和其中间体的方法
    • US3920755A
    • 1975-11-18
    • US51556974
    • 1974-10-17
    • INT FLAVORS & FRAGRANCES INC
    • SCHREIBER WILLIAM LPITTET ALAN O
    • C11B9/00C07C43/30
    • C07C45/45C07C45/004C07C45/515C07C45/62C07C45/67C11B9/0015C07C49/255C07C47/20C07C47/21
    • Processes for producing novel 2-alkylidene-3-alkynals and 2alkylidene-3-alkenals which comprise reacting an alkyl metallo acetylide with a dialkoxy acetonitrile or a dialkoxy dialkyl acetamide to form an imine salt, hydrolyzing the imine salt to form a 1,1-dialkoxy-3-alkyn-2-one, alternatively (a) first treating the alkynone with an alkylidene tri-substituted phosphorane or an alkylidene phosphorous triamide or an alkyl phosphoramide anionic compound to provide a dialkoxy alkylidene alkyne, and then either (1) hydrolyzing the dialkoxy alkylidene alkyne to form a novel aldehyde, an alkylidene alkynal, and if desired, reducing the triple bond of the alkylidene alkynal to a double bond to obtain the corresponding alkylidene alkenal or (2) first reducing the dialkoxy alkylidene alkyne to form a 1,1dialkoxy-2-alkylidene-3-alkene and if desired then hydrolyzing said 1,1-dialkoxy-2-alkylidene-3-alkene to form the desired 2alkylidene-3-alkenal; or (b) first reducing the alkynone to form a 1,1-dialkoxy-3-alken-2-one and then treating the 1,1-dialkoxy3-alken-2-one with an alkylidene tri-substituted phosphorane or an alkylidene phosphorous triamide or an alkyl phosphoramide anionic compound to provide a dialkoxy alkylidene alkene and, if desired, then hydrolyzing said dialkoxy alkylidene alkene to form the desired 2-alkylidene-3-alkenal; together with novel alkylidene alkynals and acetals thereof so produced.