Preparation of citral
    3.
    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。

    Preparation of higher unsaturated ketones
    4.
    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 。

    Manufacture of 2-methyl-2-hepten-6-one
    5.
    发明授权
    Manufacture of 2-methyl-2-hepten-6-one 失效
    制备2-甲基-2-庚烯-6-酮

    公开(公告)号:US4173588A

    公开(公告)日:1979-11-06

    申请号:US848211

    申请日:1977-11-03

    CPC分类号: C07C45/676

    摘要: An improved process for the manufacture of 2-methyl-2-hepten-6-one by reacting an alkyl acetoacetate with 2-methyl-3-buten-2-ol in the presence of an organic aluminum compound such as aluminum trialcoholate, aluminum triacetoacetate, aluminum alkylacetoacetate or aluminum triaryloxylate. 2-Methyl-2-hepten-6-one is an intermediate for the manufacture of vitamins.

    摘要翻译: 通过使乙酰乙酸烷基酯与2-甲基-3-丁烯-2-醇在有机铝化合物如仲醇酸铝,三乙酰乙酸铝的存在下反应来制备2-甲基-2-庚烯-6-酮的改进方法 ,烷基乙酰乙酸铝或三芳氧基铝。 2-甲基-2-庚烯-6-酮是制造维生素的中间体。

    Manufacture of acetals
    6.
    发明授权
    Manufacture of acetals 失效
    缩醛的制造

    公开(公告)号:US4133836A

    公开(公告)日:1979-01-09

    申请号:US801561

    申请日:1977-05-31

    摘要: A process for the manufacture of acetals by reacting aliphatic aldehydes with aliphatic alcohols, especially olefinically unsaturated aldehydes and allyl alcohols, in the presence of a distillable acid, especially nitric acid, using a rectifying column as the reaction vessel. The products may be used as starting materials for plastics, active substances, scents and vitamins.

    摘要翻译: 通过使用精馏塔作为反应容器,在可馏出的酸,特别是硝酸的存在下,使脂族醛与脂族醇,特别是烯属不饱和醛和烯丙醇反应来制造缩醛的方法。 该产品可用作塑料,活性物质,气味和维生素的起始原料。

    Preparation of chromane derivatives
    8.
    发明授权
    Preparation of chromane derivatives 失效
    色烯衍生物的制备

    公开(公告)号:US4268446A

    公开(公告)日:1981-05-19

    申请号:US121170

    申请日:1980-02-13

    CPC分类号: C07D311/66

    摘要: Chromane derivatives (I) ##STR1## where R.sup.1, R.sup.2 and R.sup.3 are H or C.sub.1 -C.sub.8 -alkyl, R.sup.4 is H, C.sub.1 -C.sub.8 -alkyl or C.sub.1 -C.sub.8 -acyl and R.sup.5 is C.sub.1 -C.sub.8 -alkyl are prepared by reacting a hydroquinone (II) ##STR2## with a Lewis acid or a Lewis acid derivative having the same action, and with a nitrile CH.sub.2 .dbd.CH--C(R.sup.5)(OR.sup.6)CN (III), where R.sup.6 is H, C.sub.1 -C.sub.4 -acyl or C.sub.1 -C.sub.4 -alkyl, or with a compound from which III is formed in situ, in the presence of an inert solvent.

    摘要翻译: 色原烷衍生物(I)其中R 1,R 2和R 3是H或C 1 -C 8 - 烷基,R 4是H,C 1 -C 8 - 烷基或C 1 -C 8酰基,R 5是C 1 -C 8 - 烷基是通过 使氢醌(II)II与具有相同作用的路易斯酸或路易斯酸衍生物反应,并与腈CH2 = CH-C(R5)(OR6)CN(III)反应,其中R6为H,C1 -C 1-4酰基或C 1 -C 4 - 烷基,或与惰性溶剂存在下原位形成III的化合物反应。