Process for preparing 4,6-diamino-resorcinol dihydrochloride
    3.
    发明授权
    Process for preparing 4,6-diamino-resorcinol dihydrochloride 失效
    制备4,6-二氨基间苯二酚二盐酸盐的方法

    公开(公告)号:US6093852A

    公开(公告)日:2000-07-25

    申请号:US180972

    申请日:1998-11-17

    CPC分类号: C07C213/02

    摘要: The invention concerns 4,6-diamino-resorcinol which is prepared in the form of its dihydrochloride by catalytic hydrogenation of 1,3-benzyloxy-4,6-dinitrobenzene on a noble metal contact in a two-phase mixture of dilute aqueous hydrochloric acid and an organic solvent which is not miscible with dilute aqueous hydrochloric acid. This process is carried out at a pressure of between 1 and 200 bar and a temperature of between 0 and 200.degree. C.

    摘要翻译: PCT No.PCT / EP97 / 02409 Sec。 371日期:1998年11月17日 102(e)1998年11月17日PCT PCT 1997年5月12日PCT公布。 出版物WO97 / 44311 日期1997年11月27日本发明涉及通过在二相混合物中贵金属接触上的1,3-苄氧基-4,6-二硝基苯的催化氢化制备其二盐酸盐形式的4,6-二氨基间苯二酚 的稀盐酸水溶液和与稀盐酸水溶液不混溶的有机溶剂。 该方法在1至200巴之间的压力和0至200℃的温度下进行。

    Process for the preparation of 4,6-diaminoresorcinol
    4.
    发明授权
    Process for the preparation of 4,6-diaminoresorcinol 失效
    制备4,6-二氨基间苯二酚的方法

    公开(公告)号:US5574188A

    公开(公告)日:1996-11-12

    申请号:US549241

    申请日:1995-10-27

    摘要: 4,6-diaminoresorcinol can be prepared in a plurality of steps in such a way thata) 1,3-dichlorobenzene is nitrated with a mixed acid of HNO.sub.3, H.sub.2 SO.sub.4 and SO.sub.3 at 0 to 40.degree. C. in anhydrous H.sub.2 SO.sub.4,b) the resulting 1,3-dichloro-4,6/2,4-dinitrobenzene isomeric mixture is first reacted with benzyl alcohol in the presence of a strong base at -15.degree. C. to +15.degree. C. and then at 20.degree. to 40.degree. C. to give the dibenzyloxy compound andc) the 1,3-dibenzyloxy-4,6-dinitrobenzene isomer arising in pure form in b) is converted to the 4,6-diaminoresorcinol by catalytic hydrogenation.

    摘要翻译: 可以以多个步骤制备4,6-二氨基间苯二酚,使得a)在无水H 2 SO 4中在0至40℃下用HNO 3,H 2 SO 4和SO 3的混合酸硝化1,3-二氯苯,b) 所得的1,3-二氯-4,6 / 2,4-二硝基苯异构体混合物首先在强碱存在下在-15℃至+ 15℃下与苄醇反应,然后在20℃至 40℃,得到二苄氧基化合物,和c)在b)中以纯形式产生的1,3-二苄氧基-4,6-二硝基苯异构体通过催化氢化转化为4,6-二氨基间苯二酚。

    Process for the preparation of 5-hydroxymethylthiazole
    6.
    发明授权
    Process for the preparation of 5-hydroxymethylthiazole 失效
    5-羟甲基噻唑的制备方法

    公开(公告)号:US5780638A

    公开(公告)日:1998-07-14

    申请号:US762625

    申请日:1996-12-09

    IPC分类号: C07D277/24

    CPC分类号: C07D277/24

    摘要: 5-Hydroxymethylthiazole is prepared in an improved manner by reducing 5-formylthiazole using a borane compound. Particularly advantageous in this case is the use of 5-formylthiazole which has been obtained by reaction of a 2-halomalonaldehyde compound with thioformamide in the presence of less than 5% by weight of water (based on the reaction mixture).

    摘要翻译: 使用硼烷化合物还原5-甲酰基噻唑,以改进的方式制备5-羟基甲基噻唑。 在这种情况下特别有利的是使用5-甲酰基噻唑,其通过2-卤代甲醛化合物与硫代甲酰胺在小于5重量%的水(基于反应混合物)的存在下反应获得。

    Process for preparing 2-cyanoindan-1-ones
    7.
    发明授权
    Process for preparing 2-cyanoindan-1-ones 失效
    2-氰基茚满-1-酮的制备方法

    公开(公告)号:US06355827B1

    公开(公告)日:2002-03-12

    申请号:US09485957

    申请日:2000-02-18

    IPC分类号: C07C25314

    摘要: In a particularly advantageous process for producing 2-cyanoindan-1-ones from 2-halogenated indan-1-ones by reaction with a cyanide salt, the cyanide salt is dissolved in a dipolar aprotic solvent or in a water-miscible ether and 2-halogenated indan-1-one is metered into this solution.

    摘要翻译: 在通过与氰化物盐反应从2-卤代茚满-1-酮生成2-氰基茚满-1-酮的特别有利的方法中,将氰化物盐溶于偶极非质子溶剂或水混溶性醚中, 将卤代茚满-1-酮计量加入该溶液中。