Process for producing vitamin A derivatives
    1.
    发明授权
    Process for producing vitamin A derivatives 失效
    生产维生素A衍生物的方法

    公开(公告)号:US5424478A

    公开(公告)日:1995-06-13

    申请号:US215813

    申请日:1994-03-22

    IPC分类号: C07C69/07 C07C403/12

    CPC分类号: C07C403/12 C07C2101/16

    摘要: The present specification relates to an industrially advantageous process for producing vitamin A derivatives which are useful as medicaments, feed additives, food additives and the like. The process provides vitamin A derivatives, particularly all-trans vitamin A derivatives in high yield and purity.

    摘要翻译: 本说明书涉及可用作药物,饲料添加剂,食品添加剂等的维生素A衍生物的工业上有利的方法。 该方法以高产率和纯度提供维生素A衍生物,特别是全反式维生素A衍生物。

    Vinyl chloroformates and preparation
    3.
    发明授权
    Vinyl chloroformates and preparation 失效
    乙烯基氯甲酸酯和制备

    公开(公告)号:US4808743A

    公开(公告)日:1989-02-28

    申请号:US14286

    申请日:1987-02-13

    CPC分类号: C07C69/96

    摘要: Vinyl chloroformates are described of formula ##STR1## in which: R.sub.1 .dbd.R.sub.2 .dbd.Cl, Br or a saturated 1-4 carbon atom alkyl or together they form a cycloaliphatic ring of 4-8 carbon atoms;R.sub.3 .dbd.H when R.sup.1 or R.sup.2 .dbd.alkyl; saturated alkyl of 1-4 carbon atoms or aryl; ##STR2## in which R.sub.4 .dbd.R.sub.5 .dbd.alkyl of 1-4 carbon atoms or R.sub.3 forms with R.sub.2 a C.sub.5 -C.sub.8 ring which may have attached oxygen atoms. The process of preparation consists of reacting phosgene with the corresponding compounds containing alpha halogen and a carbonyl group. The products are very useful to obtain vinyl carbonates and carbamates.

    摘要翻译: 氯甲酸乙酯描述为式,其中:R1 = R2 = Cl,Br或饱和1-4个碳原子的烷基,或一起形成4-8个碳原子的脂环族环; 当R1或R2 =烷基时R3 = H; 1-4个碳原子的饱和烷基或芳基; 其中R 4 = R 5 = 1-4个碳原子的烷基或R 3与R 2形成可具有连接氧原子的C 5 -C 8环。 制备方法包括使光气与含有α卤素和羰基的相应化合物反应。 该产品对于获得乙烯基碳酸酯和氨基甲酸酯是非常有用的。

    Process for producing alkylphenols
    6.
    发明授权
    Process for producing alkylphenols 失效
    制备烷基酚的方法

    公开(公告)号:US3976702A

    公开(公告)日:1976-08-24

    申请号:US555113

    申请日:1975-03-04

    CPC分类号: C07C39/06

    摘要: This invention relates to a process for producing alkylphenols by oxidation of alkyl-substituted aromatic aldehydes with hydrogen peroxide in the presence of hydrogen fluoride and hydrolysis thereof. More particularly, under the presence of hydrogen fluoride alkyl substituted aromatic aldehydes are oxidized and converted selectively to aromatic alkyl phenol formates by hydrogen peroxide, without converting to corresponding aromatic carboxylic acid. After the completion of the oxidizing reaction, the produced alkyl phenol formates are hydrolyzed to corresponding alkyl phenols at the time of removing the remaining hydrogen fluoride by distillation.

    摘要翻译: 本发明涉及通过在氟化氢存在下用过氧化氢氧化烷基取代的芳族醛并进行水解而制备烷基酚的方法。 更具体地,在氟化氢存在下,烷基取代的芳族醛被氧化并通过过氧化氢选择性地转化成芳族烷基苯酚甲酸酯,而不转化为相应的芳族羧酸。 氧化反应完成后,通过蒸馏除去剩余的氟化氢时,生成的烷基苯酚甲酸酯被水解成相应的烷基酚。