Preparation of p-nitrophenolic compounds
    43.
    发明授权
    Preparation of p-nitrophenolic compounds 失效
    对硝基酚类化合物的制备

    公开(公告)号:US5414148A

    公开(公告)日:1995-05-09

    申请号:US249200

    申请日:1994-05-26

    CPC classification number: C07C201/00 C07C201/08

    Abstract: p-Nitrophenolic compounds, e.g., p-nitrophenol itself, are selectively prepared by (a) reacting a phenolic compound with a nitrosating agent in the presence of sulfuric acid, the concentration of which H.sub.2 SO.sub.4 being at least 60%, (b) oxidizing the p-nitrosophenolic compound thus formed with nitric acid, the concentration of sulfuric acid in the medium of reaction, upon completion of oxidation, being no greater than 80%, and (c) separating the p-nitrophenolic compound which thus precipitates.

    Abstract translation: 通过(a)在硫酸存在下使酚类化合物与亚硝化剂反应,其中H 2 SO 4的浓度为至少60%,(b)将硝基酚类化合物氧化为 由硝酸形成的对亚硝基苯酚化合物,氧化后的反应介质中的硫酸浓度不大于80%,(c)分离因此析出的对硝基酚化合物。

    Process for producing 2,4-dichloro-3-alkyl-6-nitrophenol
    45.
    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 classification number: C07C201/10

    Abstract: 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.

    Abstract translation: 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 pentachloronitrobenzene from hexachlorobenzene
    47.
    发明授权
    Process for producing pentachloronitrobenzene from hexachlorobenzene 失效
    六氯苯生产五氯硝基苯的方法

    公开(公告)号:US4461918A

    公开(公告)日:1984-07-24

    申请号:US461885

    申请日:1983-01-28

    CPC classification number: C07C323/00 C07C201/10

    Abstract: Disclosed is a process for producing pentachloronitrobenzene (PCNB) by reacting hexachlorobenzene (HEX) with sodium hydrosulfide (NaSH) in the presence of sodium hydroxide (NaOH), sodium carbonate (Na.sub.2 CO.sub.3), or mixtures thereof to produce the sodium salt of pentachlorothiophenol (PCTP), followed by reacting it (or PCTP itself after acidifying) with nitric acid in the presence of sulfuric acid or oleum.

    Abstract translation: 公开了在氢氧化钠(NaOH),碳酸钠(Na 2 CO 3)或其混合物存在下使六氯苯(HEX)与氢硫化钠(NaSH)反应生产五氯硝基苯(PCNB)的方法,以生产五氯苯硫酚钠盐 ),然后使其(或酸化后的PCTP本身)与硝酸在硫酸或发烟硫酸的存在下反应。

    Synthesis of nitromethane
    49.
    发明授权
    Synthesis of nitromethane 失效
    硝基甲烷的合成

    公开(公告)号:US4424385A

    公开(公告)日:1984-01-03

    申请号:US404127

    申请日:1982-08-02

    CPC classification number: C07C201/10

    Abstract: An improved process for forming nitromethane by contacting liquid methyl halide with an alkali or alkaline earth metal nitrite in the presence of an excess of the liquid methyl halide.

    Abstract translation: 通过使液体甲基卤化物与碱金属或碱土金属亚硝酸盐在过量的液体甲基卤化物存在下接触来形成硝基甲烷的改进方法。

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