Preparation of higher unsaturated ketones
    7.
    发明授权
    Preparation of higher unsaturated ketones 失效
    制备较高级的不饱和酮

    公开(公告)号:US4310705A

    公开(公告)日:1982-01-12

    申请号:US163401

    申请日:1980-06-26

    CPC分类号: C07C45/676

    摘要: 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.

    摘要翻译: 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 。

    Process for the preparation of unsaturated alcohols and/or esters thereof
    8.
    发明授权
    Process for the preparation of unsaturated alcohols and/or esters thereof 失效
    制备不饱和醇和/或其酯的方法

    公开(公告)号:US4645863A

    公开(公告)日:1987-02-24

    申请号:US457464

    申请日:1983-01-12

    摘要: Process for the preparation of unsaturated alcohols and/or esters thereof by reacting conjugated dienes with water and/or aqueous carboxylic acid solutions in the presence of a macroporous acid ion exchanger and suitable solvents. The diene has the general formula I ##STR1## in which R.sup.1, R.sup.2 and R.sup.3 are hydrogen or a methyl group and R.sup.2 also can represent an aliphatic hydrocarbon radical having 2 to 6 carbon atoms which may contain a double bond which is not in a conjugated position relative to the double bonds of the diene, and preferably R.sup.1 and R.sup.3 each represent groups CH.sub.3 or CH.sub.2 --CH.sub.3. Said diene is reacted in a homogeneous or quasi-homogeneous phase in the presence of said macroporous acid ion exchanger.

    摘要翻译: 在大孔酸离子交换剂和合适的溶剂存在下,共轭二烯与水和/或含水羧酸溶液反应制备不饱和醇和/或酯的方法。 二烯具有通式I(I),其中R 1,R 2和R 3是氢或甲基,R 2也可以表示具有2至6个碳原子的脂族烃基,其可以含有不是双键的脂族烃基 在相对于二烯的双键的共轭位置,优选地,R 1和R 3各自表示基团CH 3或CH 2 -CH 3。 所述二烯在所述大孔酸离子交换剂存在下在均相或准均相中反应。

    Preparation of citral
    10.
    发明授权
    Preparation of citral 失效
    柠檬醛的制备

    公开(公告)号:US4288636A

    公开(公告)日:1981-09-08

    申请号:US158346

    申请日:1980-06-10

    CPC分类号: C07C45/515

    摘要: Citral (I) ##STR1## is prepared by heating an acetal (IIa) or (IIb) ##STR2## in the presence of an acid catalyst while continuously distilling from the reaction mixture the 3-methylbut-2-en-1-ol (III, prenol) eliminated during the reaction.

    摘要翻译: 柠檬酸(I)通过在酸催化剂的存在下加热缩醛(IIa)或(IIb)IIa IIa IIB而制备,同时从反应混合物中连续蒸馏3-甲基丁-2-醇, 烯丙醇(III,前醇)在反应期间消除。