Method of preparing p-phenylenediamine
    1.
    发明授权
    Method of preparing p-phenylenediamine 有权
    对苯二胺的制备方法

    公开(公告)号:US06245943B1

    公开(公告)日:2001-06-12

    申请号:US09639507

    申请日:2000-08-16

    IPC分类号: C07C20900

    摘要: A disclosed method of preparing p-phenylenediamine includes the steps of: reacting urea and nitrobenzene with a base in the presence of a polar solvent to yield 4-nitrosoaniline and 4-nitroaniline; and subsequently, diluting the resulting mixed solution in an alcohol and performing hydrogenation using a catalyst, thereby providing highly pure p-phenylenediamine destitute of an ortho- or meta-isomer as a byproduct. The method has some advantages in that: the process is simplified in such a manner that the hydrogenation is performed in the presence of the hydrogenation catalyst in a single reactor (i.e., one pot) without a need of isolating 4-nitrosoaniline or purifying the product; inexpensive urea and an alkali base are used to reduce the production cost; and 4-nitrosoaniline is formed as an intermediate to yield p-phenylenediamine with a high selectivity, thereby requiring no purification process after isolation of the product.

    摘要翻译: 公开的制备对苯二胺的方法包括以下步骤:在极性溶剂存在下使脲和硝基苯与碱反应,得到4-亚硝基苯胺和4-硝基苯胺; 然后将所得的混合溶液稀释在醇中并使用催化剂进行氢化,从而提供作为副产物的高纯度的邻 - 或间 - 异构体的对苯二胺。 该方法具有以下优点:该方法简化为在单个反应器(即一个罐)中在氢化催化剂存在下进行氢化,而不需要分离4-亚硝基苯胺或纯化产物 ; 使用便宜的尿素和碱碱来降低生产成本; 形成作为中间体的4-亚硝基苯胺,以高选择性产生对苯二胺,从而在分离产物后不需要纯化过程。

    Manufacturing method for 4-nitrosoaniline from urea and nitrobenzene
    2.
    发明授权
    Manufacturing method for 4-nitrosoaniline from urea and nitrobenzene 有权
    尿素和硝基苯制备4-亚硝基苯胺的制备方法

    公开(公告)号:US06198001B1

    公开(公告)日:2001-03-06

    申请号:US09525834

    申请日:2000-03-15

    IPC分类号: C07C1542

    CPC分类号: C07C209/00 C07C211/52

    摘要: A method for preparing 4-nitrosoaniline, including reacting urea and nitrobenzene in a polar organic solvent in the presence of a base at a temperature of room temperature to 150° C. The method uses a relatively cheap urea and nitrobenzene as the raw materials, and also a relatively cheap base, thereby decreasing the manufacturing cost. Urea used as an amine donor is excellent in a reactivity to nitrobenzene, and a reaction intermediate is unstable as compared with 4-(4-nitrophenyl)benzamide to easily decompose into 4-nitroaniline and 4-nitrosoaniline. This allows a reaction time and a process time to be shortened. Moreover, the method is advantageous in that waste hazardous to the environment is not produced as a byproduct.

    摘要翻译: 一种制备4-亚硝基苯胺的方法,包括在极性有机溶剂中,在碱存在下,在室温至150℃的温度下使脲和硝基苯反应。该方法使用较便宜的尿素和硝基苯作为原料, 也是一个相对便宜的基数,从而降低制造成本。 作为胺供体的尿素与硝基苯的反应性优异,与4-(4-硝基苯基)苯甲酰胺相比,反应中间体不容易分解成4-硝基苯胺和4-亚硝基苯胺。 这允许缩短反应时间和处理时间。 此外,该方法的优点在于,作为副产物不会产生对环境有害的废物。

    Method for preparing 2-methyl-1,4-naphthoquinone (vitamin K.sub.3)
    3.
    发明授权
    Method for preparing 2-methyl-1,4-naphthoquinone (vitamin K.sub.3) 失效
    2-甲基-1,4-萘醌(维生素K3)的制备方法

    公开(公告)号:US5770774A

    公开(公告)日:1998-06-23

    申请号:US758921

    申请日:1996-12-02

    IPC分类号: C07C45/69 C07C46/02 C07C46/00

    CPC分类号: C07C45/69 C07C46/02

    摘要: A method for preparing 2-methyl-1,4-naphthoquinone (vitamin K.sub.3), in which 2-methyl-1,4-benzoquinone and 1,3-butadienes are subjected to a �2+4! Diels-Alder reaction and subsequently to oxidative dehydrogenation, using dimethylsulfoxide as both a dehydrogenating agent and a solvent in the presence of at least one Lewis acid or a Broensted acid, in a single pot, shows high selectivity and yield.

    摘要翻译: 制备2-甲基-1,4-萘醌(维生素K3)的方法,其中2-甲基-1,4-苯醌和1,3-丁二烯进行[2 + 4]狄尔斯 - 阿尔德反应,随后 在单釜中,在至少一种路易斯酸或布朗斯台德酸存在下,使用二甲基亚砜作为脱氢剂和溶剂进行氧化脱氢,显示出高选择性和收率。

    Method for preparing 4-nitroso-substituted aromatic amine
    5.
    发明授权
    Method for preparing 4-nitroso-substituted aromatic amine 有权
    制备4-亚硝基取代芳香胺的方法

    公开(公告)号:US06552229B1

    公开(公告)日:2003-04-22

    申请号:US10209263

    申请日:2002-07-31

    IPC分类号: C07C20900

    摘要: Disclosed is a method for preparing a 4-nitroso-substituted aromatic amine that includes contacting an amide compound with a nitroaromatic compound in the presence of a base and a solvent to directly prepare 4-nitroso-substituted aromatic amine as a main product and 4-nitro-substituted aromatic amine as a by-product without producing 4-nitroso- or 4-nitro-substituted amide as an intermediate.

    摘要翻译: 公开了一种制备4-亚硝基取代的芳族胺的方法,其包括在碱和溶剂的存在下使酰胺化合物与硝基芳族化合物接触,以直接制备4-亚硝基取代的芳族胺作为主要产物和4- 硝基取代的芳族胺作为副产物而不产生4-亚硝基或4-硝基取代的酰胺作为中间体。

    Preparation of 4,4'-dinitrodiphenylamine from urea and nitrobenzene
    6.
    发明授权
    Preparation of 4,4'-dinitrodiphenylamine from urea and nitrobenzene 有权
    从尿素和硝基苯制备4,4'-二硝基二苯胺

    公开(公告)号:US6156932A

    公开(公告)日:2000-12-05

    申请号:US511281

    申请日:2000-02-23

    CPC分类号: C07C209/02

    摘要: A method for preparing 4,4'-dinitrodiphenylamine, including reacting urea and nitrobenzene in a polar organic solvent in the presence of a base at a temperature of room temperature to 100.degree. C. The method employs a relatively cheap urea and nitrobenzene as the raw materials, and also employs a relatively cheap base, thereby decreasing the manufacturing costs. Moreover, the method does not produce by-products, thus eliminating a need for a post-treating process. Additionally, the method is advantageous in that the production of 4,4'-dinitrodiphenylamine can be achieved in high yield and selectivity even under non-intensive reaction conditions by appropriately controlling the amounts of urea and nitrobenzene.

    摘要翻译: 一种制备4,4'-二硝基二苯胺的方法,包括在极性有机溶剂中,在碱存在下,在室温至100℃的温度下使脲和硝基苯反应。该方法采用相对便宜的尿素和硝基苯作为原料 材料,并且还采用相对便宜的基础,从而降低制造成本。 此外,该方法不产生副产物,因此不需要后处理过程。 此外,该方法的优点在于,通过适当地控制尿素和硝基苯的量,即使在非强烈的反应条件下也可以高产率和选择性地实现4,4'-二硝基二苯胺的生产。

    Method for preparing 4-nitrodiphenylamine and 4-nitrosodiphenylamine
from carbanilide
    7.
    发明授权
    Method for preparing 4-nitrodiphenylamine and 4-nitrosodiphenylamine from carbanilide 有权
    从碳酰苯胺制备4-硝基二苯胺和4-亚硝基二苯胺的方法

    公开(公告)号:US06137010A

    公开(公告)日:2000-10-24

    申请号:US501686

    申请日:2000-02-10

    CPC分类号: C07C209/00

    摘要: This invention relates to a process for preparing 4-nitrodiphenylamine and 4-nitrosodiphenylamine to be used for 4-aminodiphenylamine as an intermediate of antiozonant, wherein carbanilide is reacted with nitrobenzene in the presence of an appropriate base, while simultaneously adding aniline to the mixture so as to regenerate some amounts of carbanilide as a starting material.According to this invention, 4-nitrodiphenylamine and 4-nitrosodiphenylamine can be prepared in a higher selectivity and conversion rate via a continuous reaction by recycling carbanilide, a starting material, while adding a certain amount of aniline during the process. Further, the amount of waste water can be significantly reduced compared to the conventional method without any corrosive materials harmful to the environment.

    摘要翻译: 本发明涉及一种制备用作4-氨基二苯胺作为抗臭氧剂中间体的4-硝基二苯胺和4-亚硝基二苯胺的方法,其中将碳酰苯胺与硝基苯在适当的碱存在下反应,同时向混合物中加入苯胺 以再生一些量的碳酰苯胺作为原料。 根据本发明,4-硝基二苯胺和4-亚硝基二苯胺可以通过连续反应以更高的选择性和转化率通过循环使用碳酰苯胺(原料),同时在该过程中加入一定量的苯胺来制备。 此外,与常规方法相比,废水的量可以显着降低,而没有任何对环境有害的腐蚀性材料。

    Method for preparing ethylbenzene from 4-vinylcyclohexene
    8.
    发明授权
    Method for preparing ethylbenzene from 4-vinylcyclohexene 失效
    从4-乙烯基环己烯制备乙苯的方法

    公开(公告)号:US6130362A

    公开(公告)日:2000-10-10

    申请号:US776459

    申请日:1997-01-14

    摘要: In the presence of a heterogeneous catalyst made of palladium supported on active carbon, ethylbenzene is prepared from 4-vinylcyclohexene through catalytic transfer hydrogenation in a hydrogen donor solvent with an oxidizing agent. Reaction temperature ranges from 50 to 110.degree. C. The hydrogen donor solvent is selected from the group consisting of alcohol, water, and a mixture of these. The oxidizing agent is selected from monovalent or divalent nitro compounds, water, hydrogen peroxide, NaOCl, NaClO.sub.2, NaClO.sub.3, NaClO.sub.4, oxygen and air, and used in the amount of 0.02 to 3 moles per mole of 4-vinylcyclohexene.

    摘要翻译: PCT No.PCT / KR96 / 00076 Sec。 371日期1997年1月14日 102(e)日期1997年1月14日PCT提交1996年5月25日PCT公布。 WO96 / 37449 PCT公开号 日期1996年11月28日在由负载在活性炭上的钯制成的非均相催化剂的存在下,通过在供氢溶剂中的氧化剂的催化转移氢化由4-乙烯基环己烯制备乙苯。 反应温度范围为50至110℃。供氢溶剂选自醇,水及其混合物。 氧化剂选自单价或二价硝基化合物,水,过氧化氢,NaOCl,NaClO 2,NaClO 3,NaClO 4,氧气和空气,其用量为每摩尔4-乙烯基环己烯0.02至3摩尔。

    Method for preparing cyclohexyl phenyl ketone from 1,3-butadiene and acrylic acid
    9.
    发明授权
    Method for preparing cyclohexyl phenyl ketone from 1,3-butadiene and acrylic acid 失效
    从1,3-丁二烯和丙烯酸制备环己基苯基酮的方法

    公开(公告)号:US06881865B2

    公开(公告)日:2005-04-19

    申请号:US10628800

    申请日:2003-07-28

    CPC分类号: C07C45/46 C07C49/792

    摘要: Disclosed is a synthesis method of cyclohexyl phenyl ketone with a high selectivity and a high yield from 1,3-butadiene and acrylic acid in the presence or absence of benzene or a non-aromatic organic solvent in the same reaction without a step of separating or purifying intermediates, the synthesis method including sequentially carrying out a [2+4] Diels-Alder reaction, a hydrogenation reaction, a chlorination reaction and a Friedel-Crafts reaction in the presence/absence of benzene or a non-aromatic organic solvent without separation of intermediates.

    摘要翻译: 公开了在相同反应中,在存在或不存在苯或非芳族有机溶剂的情况下,具有高选择性和高收率的环己基苯基酮的合成方法,无需分离或分离步骤 纯化中间体,合成方法包括在存在/不存在苯或非芳族有机溶剂的情况下,不分离地依次进行[2 + 4] Diels-Alder反应,氢化反应,氯化反应和Friedel-Crafts反应 的中间体。