Method for preparing 2-nitro-5-(phenylthio)-anilines
    2.
    发明授权
    Method for preparing 2-nitro-5-(phenylthio)-anilines 失效
    2-硝基-5-(苯硫基) - 苯胺的制备方法

    公开(公告)号:US06552230B1

    公开(公告)日:2003-04-22

    申请号:US09720011

    申请日:2000-12-19

    IPC分类号: C07C32300

    CPC分类号: C07C319/14 C07C323/37

    摘要: The invention relates to a process for preparing 2-nitro-5-(phenylthio)anilines of formula (I) wherein R1 represents hydrogen, C1-C8-alkyl, C3-C8-cycloalkyl, C1-C8-alkoxy, or halogen and R2 represents hydrogen, C1-C8-alkyl, C3-C8-cycloalkyl, C1-C8-alkoxy, halogen, or C6-C10-aryl optionally substituted with C1-C8-alkyl, C1-C8-alkoxy, or halogen, by reacting, in a solvent, a 5-chloro-2-nitroaniline of the formula (II) wherein R1 is as defined for formula (I), with a thiophenol of the formula (III) wherein R2 is as defined for formula (I), and ammonia.

    摘要翻译: 本发明涉及式(I)的2-硝基-5-(苯硫基)苯胺的制备方法,其中R 1表示氢,C 1 -C 8 - 烷基,C 3 -C 8 - 环烷基,C 1 -C 8 - 烷氧基或卤素,R 2表示氢 ,C 1 -C 8 - 烷基,C 3 -C 8 - 环烷基,C 1 -C 8 - 烷氧基,卤素或任选被C 1 -C 8 - 烷基,C 1 -C 8 - 烷氧基或卤素取代的C 6 -C 10 - 芳基, 溶剂,其中R 1如式(I)所定义的式(II)的5-氯-2-硝基苯胺与式(III)的苯硫酚(其中R 2如式(I)所定义)和氨。

    Process for the purification of nitrobenzaldenhyde
    3.
    发明授权
    Process for the purification of nitrobenzaldenhyde 失效
    硝基苯甲醛的纯化方法

    公开(公告)号:US4910345A

    公开(公告)日:1990-03-20

    申请号:US231740

    申请日:1988-08-12

    CPC分类号: C07C201/16

    摘要: Crude nitrobenzaldehyde can be substantially purified from the undesired positional isomers if a treatment with 100-10,000% by weight of water and 1-30% by weight of an emulsifier, all with reference to the dry weight of the crude nitrobenzaldehyde, is undertaken at a temperature of 30.degree.-140.degree. C. and at a pH of 3-14.

    摘要翻译: 如果使用100-10,000重量%的水和1-30重量%的乳化剂处理,全部参照粗制硝基苯甲醛的干重,就可以从不希望的位置异构体中纯化粗硝基苯甲醛。 温度为30°-140℃,pH为3-14。

    Process for the preparation of aromatic methoxycarboxylic acid methyl
esters
    5.
    发明授权
    Process for the preparation of aromatic methoxycarboxylic acid methyl esters 失效
    制备芳族甲氧基羧酸甲酯的方法

    公开(公告)号:US5763641A

    公开(公告)日:1998-06-09

    申请号:US785375

    申请日:1997-01-17

    CPC分类号: C07C67/11 C07C67/31

    摘要: In a process, improved in respect of yield, purity and simple procedure, for the preparation of aromatic methoxycarboxylic acid methyl esters by methylation of the corresponding aromatic hydroxycarboxylic acids with dimethyl sulfate in the presence of water and a base, a procedure is followed in which the water, base and aromatic hydroxycarboxylic acid are initially introduced into the reaction vessel, 1 to 2.5 times the molar amount of dimethyl sulfate (based on the methylatable hydroxyl and carboxyl groups) is metered in and, during this procedure, the pH of the reaction mixture is controlled by addition of an aqueous base in finely divided form.

    摘要翻译: 在一个方法中,通过相对应的芳族羟基羧酸与硫酸二甲酯在水和碱的存在下甲基化制备芳族甲氧基羧酸甲酯,在产率,纯度和简单方法方面得到改进,其中遵循以下步骤 首先将水,碱和芳族羟基羧酸引入反应容器中,计量硫酸二甲酯的摩尔量(基于可甲基化的羟基和羧基)的1至2.5倍,并且在该过程中,反应的pH 通过加入精细分散形式的水性碱来控制混合物。