Process for producing 2,4-dichloro-3-alkyl-6-nitrophenol
    9.
    发明授权
    Process for producing 2,4-dichloro-3-alkyl-6-nitrophenol 失效
    2,4-二氯-3-烷基-6-硝基苯酚的制备方法

    公开(公告)号:US5012015A

    公开(公告)日:1991-04-30

    申请号:US319718

    申请日:1989-03-07

    CPC分类号: C07C201/10

    摘要: 2,4-Dichloro-3-alkyl-6-nitrophenol, which is a precursor of 2,4-dichloro-3-alkyl-6-aminophenol useful for the production of a cyan coupler to be used with a sensitive material in the field of a photography in color, is industrially advantageously produced by (a) nitration of 2,4,5-trichloro-3-alkylbenzene, followed by hydrolysis of the resulting 2,4,5-trichloro-3-alkyl-6-nitrobenzene, or (b) hydrolysis of 2,4,5-trichloro-3-alkylbenzene-6-sulfonic acid or a salt thereof, followed by nitration of the resulting 2,4-dichloro-3-alkylphenol-6-sulfonic acid or a salt thereof, the starting material usable for these processes being 4-alkylbenzenesulfonic acid or a salt thereof, which is easily available.

    摘要翻译: 2,4-二氯-3-烷基-6-硝基苯酚,它是2,4-二氯-3-烷基-6-氨基苯酚的前体,可用于生产与现场敏感材料一起使用的青色成色剂 在工业上有利地通过(a)2,4-二氯-3-烷基苯的硝化,然后水解所得的2,4,5-三氯-3-烷基-6-硝基苯, 或(b)2,4,5-三氯-3-烷基苯-6-磺酸或其盐的水解,然后硝化得到的2,4-二氯-3-烷基苯酚-6-磺酸或盐 可用于这些方法的原料是4-烷基苯磺酸或其盐,其容易获得。

    Process for producing 1,4-dihydroxy-2-arylnaphthoate
    10.
    发明授权
    Process for producing 1,4-dihydroxy-2-arylnaphthoate 失效
    1,4-二羟基-2-芳基萘甲酸酯的制备方法

    公开(公告)号:US5241103A

    公开(公告)日:1993-08-31

    申请号:US931068

    申请日:1992-08-17

    IPC分类号: C07C67/58 C07C69/94

    CPC分类号: C07C67/58 C07C69/94

    摘要: Pure 1,4-dihydroxy-2-arylnaphthoate is prepared in high yield by allowing 1,4-dihydroxy-2-naphthoic acid to react with triarylphosphite in the presence of an acid catalyst selected from organic and inorganic acids and crystallizing from a mixed solvent consisting essentially of lower alcohols and water until 1,4-dihydroxy-2-naphthoic acid is isolated and is further purified by crystallization from a mixed solvent consisting essencially of lower alcohols, water and extraction solvent, i.e., alkyl-substituted aromatic hydrocarbons or halogen-substituted aliphatic or aromatic hydrocarbons.

    摘要翻译: 通过使1,4-二羟基-2-萘甲酸在选自有机酸和无机酸的酸催化剂存在下与亚磷酸三芳基酯反应,并从混合溶剂中结晶而以高产率制备纯1,4-二羟基-2-芳基萘甲酸盐 基本上由低级醇和水组成,直到分离出1,4-二羟基-2-萘甲酸,并通过从低级醇,水和萃取溶剂即烷基取代的芳族烃或卤素的混合溶剂中结晶进一步纯化 取代的脂族或芳族烃。