Process for the preparation of high quality 3,3′,4,4′-tetraminobiphenyl
    3.
    发明授权
    Process for the preparation of high quality 3,3′,4,4′-tetraminobiphenyl 有权
    制备高品质3,3',4,4'-四磺酰联苯的方法

    公开(公告)号:US06835854B1

    公开(公告)日:2004-12-28

    申请号:US10804886

    申请日:2004-03-19

    IPC分类号: C07C21100

    CPC分类号: C07C209/36 C07C211/55

    摘要: The present invention relates to a process for the preparation of pure high quality 3,3′, 4,4′-tetraminobiphenyl (TAB) in high yields. The present invention also discloses a process for the preparation of 3,3′,4,4′ tetraminobiphenyl (TAB) comprising a three step process: (1) oxidation 3,3′-dichloro 4,4′-diaminobiphenyl (DCB) with 50% aq. H2O2, (2) ammonolysis of the resulting 3,3′-dinitro 4,4′-dinitrobiphenyl (DCDNB) and (3) reduction of 3,3′-diamino-4,4′-dinitrobiphenyl (DADNB) with stannous chloride and concentrated hydrochloric acid.

    摘要翻译: 本发明涉及以高产率制备纯高质量3,3',4,4'-四氨联苯(TAB)的方法。 本发明还公开了一种制备3,3',4,4'四氨基联苯(TAB)的方法,包括三步法:(1)将3,3'-二氯4,4'-二氨基联苯(DCB)与 50%aq。 H 2 O 2,(2)得到的3,3'-二硝基4,4'-二硝基联苯(DCDNB)的氨解和(3)用氯化亚锡还原3,3'-二氨基-4,4'-二硝基联苯(DADNB) 浓盐酸。

    Dithiocarboxylic ester synthetic process
    4.
    发明授权
    Dithiocarboxylic ester synthetic process 有权
    二硫代羧酸酯合成工艺

    公开(公告)号:US06458968B2

    公开(公告)日:2002-10-01

    申请号:US09877455

    申请日:2001-06-08

    IPC分类号: C07D33322

    CPC分类号: C07C327/36

    摘要: A process the preparation of a dithiocarboxylic esters comprises reacting a carboxylic acid compound of formula R1(COOH)m, a compound of formula R2AH and phosphorus pentasulfide to produce a compound of structure I. An alternate process comprises reacting a compound of formula R3(COAH)m and a compound of structure II in the presence of a clay catalyst; and treating products of the reaction with a thiating agent to produce a compound of structure III, a compound of structure IV, or a combination of compounds of structure III and structure IV.

    摘要翻译: 制备二硫代羧酸酯的方法包括使式R1(COOH)m的羧酸化合物,式R2AH的化合物和五硫化二磷反应以制备结构I的化合物。另一种方法包括使式R3(COAH) 和在粘土催化剂存在下的结构II的化合物; 并用硫化剂处理反应产物以产生结构III的化合物,结构IV的化合物或结构III和结构IV的化合物的组合。