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    • 1. 发明授权
    • Preparation of higher unsaturated ketones
    • 制备较高级的不饱和酮
    • US4310705A
    • 1982-01-12
    • US163401
    • 1980-06-26
    • Axel NissenGerd KaibelOtto WoerzLothar ArnoldManfred BraunWalter Rebafka
    • Axel NissenGerd KaibelOtto WoerzLothar ArnoldManfred BraunWalter Rebafka
    • C07C49/20B01J31/14C07C45/00C07C45/67C07C45/68C07C67/00C07C45/48
    • C07C45/676
    • An improved process for the preparation of higher unsaturated ketones, such as geranylacetone and farnesylacetone, by reacting a .beta.,.gamma.-unsaturated alcohol and an alkyl acetoacetate at an elevated temperature in the presence of an organic aluminum compound, with elimination, and removal, of the alcohol derived from the alkyl acetoacetate in a reactor system carrying a fractionating column. The improvement in the purity, yield, and especially space-time yield of the product is achieved by starting from an alcohol having a higher boiling point than that of the alkyl acetoacetate used, carrying out the reaction in the presence of a small amount of an inert liquid which has a boiling point between that of the alkyl acetoacetate and the alcohol to be eliminated therefrom, and ensuring that the temperature at the bottom of the fractionating column is only slightly higher than the boiling point of the added liquid, under the prevailing pressure.
    • 通过在有机铝化合物的存在下在升高的温度下使β,γ-不饱和醇和乙酰乙酸烷基酯反应来制备高级不饱和酮,如香叶基丙酮和法呢基丙酮的改进方法,消除和除去 在含有分馏塔的反应器系统中衍生自乙酰乙酸烷基酯的醇。 通过从具有比所用乙酰乙酸烷基酯的沸点高的醇开始的醇开始,在少量的存在下进行反应来实现产物的纯度,产率和特别的时空产率的改善 沸点在乙酰乙酸烷基酯和被除去的醇之间的沸点的惰性液体,并且确保分馏塔底部的温度仅略高于添加液体的沸点,在主要压力下 。