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    • 6. 发明授权
    • Process for preparing 2,5,6-trimethyl-2-cyclohexen-1-one
    • 制备2,5,6-三甲基-2-环己烯-1-酮的方法
    • US5994589A
    • 1999-11-30
    • US265695
    • 1999-03-10
    • Detlef RuffWolfram BurstWulf KaiserManfred Stroezel
    • Detlef RuffWolfram BurstWulf KaiserManfred Stroezel
    • C07C45/72C07C45/74C07C49/603C07C45/75
    • C07C45/74
    • A process for preparing 2,5,6-trimethyl-2-cyclohexen-1-one by reacting diethyl ketone with crotonaldehyde or a compound which is converted under the chosen reaction conditions into crotonaldehyde, in the presence of basic agents at elevated temperature, which comprisesa) simultaneously pumping one mole of crotonaldehyde or one mole of a compound which is converted under the reaction conditions into crotonaldehyde, about 5 to 30 moles of diethyl ketone and the aqueous solution or suspension of a strong base, through separate lines or at least partly in the form of a suitable mixture, continuously into a pressure vessel, which is heated where appropriate and which ensures vigorous mixing, in such a way thatb) the reaction temperature is between 150.degree. C. and 350.degree. C., and the average residence time in the pressure vessel is only about 0.1 second to 20 minutes.
    • 一种通过使二乙基酮与巴豆醛或在选择的反应条件下转化成巴豆醛的化合物在高温下在碱性试剂存在下制备2,5,6-三甲基-2-环己烯-1-酮的方法, 包括a)同时泵送一摩尔巴豆醛或1摩尔在反应条件下转化为巴豆醛的化合物,约5至30摩尔二乙基酮和强碱的水溶液或悬浮液,通过分开的管线或至少 部分以合适混合物的形式,连续地进入压力容器,其在适当时被加热并且确保剧烈混合,使得b)反应温度在150℃和350℃之间,并且 在压力容器中的平均停留时间仅为约0.1秒至20分钟。