Process for the preparation of a dicarboxylic acid dichloride
    3.
    发明授权
    Process for the preparation of a dicarboxylic acid dichloride 失效
    制备二羧酸二氯化物的方法

    公开(公告)号:US5616795A

    公开(公告)日:1997-04-01

    申请号:US650094

    申请日:1996-05-17

    CPC分类号: C07C227/18 C07C381/10

    摘要: The present invention refers to a process for the preparation of 5-amino-2,4,6-triiodo-1,3-benzenedicarboxylic acid dichloride, comprising the reaction in heterogeneous phase between 5-amino-2,4,6-triiodo-1,3-benzenedicarboxylic acid and thionyl chloride, in a solvent selected from the group consisting of: (C.sub.7 -C.sub.16) linear or branched hydrocarbons, (C.sub.7 -C.sub.8) aromatic hydrocarbons, 1,1,1-trichloroethane, n-butylacetate, diglyme (diethylenglycoledimethylether), and in the presence of a catalytic amount of a tertiary amine.

    摘要翻译: 本发明涉及一种制备5-氨基-2,4,6-三碘-1,3-苯二甲酸二氯化物的方法,其包括在5-氨基-2,4,6-三碘代 - (C7-C16)直链或支链烃,(C7-C8)芳族烃,1,1,1-三氯乙烷,乙酸正丁酯,丙酸正丁酯, 二甘醇二甲醚(二乙二醇二乙醚),并在催化量的叔胺存在下进行。

    Process for the preparation of a halosubstituted aromatic acid
    4.
    发明授权
    Process for the preparation of a halosubstituted aromatic acid 失效
    制备卤代芳族酸的方法

    公开(公告)号:US5763650A

    公开(公告)日:1998-06-09

    申请号:US645448

    申请日:1996-05-13

    CPC分类号: C07C227/04 C07C227/16

    摘要: The present invention refers to a process for the preparation of 5-amino-2,4,6-triiodo-1,3-benzenedicarboxylic acid, comprising the following steps: a) catalytic hydrogenation of 5-nitro-1,3-benzenedicarboxylic acid in neutral or basic environment, which gives an aqueous solution of 5-amino-1,3-benzenedicarboxylic acid sodium salt; b) direct iodination of the 5-amino-1,3-benzenedicarboxylic acid sodium salt solution deriving from step a), without further purification, with a solution of ICl in HCl, being the 5-amino-1,3-benzenedicarboxylic acid sodium salt solution previously added with HCl and H.sub.2 SO.sub.4.

    摘要翻译: 本发明涉及一种制备5-氨基-2,4,6-三碘-1,3-苯二甲酸的方法,包括以下步骤:a)5-硝基-1,3-苯二甲酸的催化氢化 在中性或碱性环境中,得到5-氨基-1,3-苯二甲酸钠盐的水溶液; b)不经进一步纯化,用ICl在HCl中的溶液直接碘化来自步骤a)的5-氨基-1,3-苯二甲酸钠盐溶液,为5-氨基-1,3-苯二甲酸钠 盐溶液先前加入HCl和H2SO4。