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    PREPARATION OF NITROPHENOL
    201.
    发明专利
    PREPARATION OF NITROPHENOL 失效

    公开(公告)号：JPH06336464A

    公开(公告)日：1994-12-06

    申请号：JP11308994

    申请日：1994-05-26

    Applicant: RHONE POULENC CHIMIE

    Inventor： PASUKARU METEIBIE ,  ROORAN BERUNAARU

    IPC: C07C201/06 ,  C07C201/10 ,  C07C205/22 ,  C07C207/04

    Abstract: The subject of the present invention is a process for the preparation of nitrophenols. More particularly, the invention relates to the preparation of p-nitrophenol. The process of preparation of the invention, which consists in preparing p-nitrophenol by nitrosation of phenol in the presence of sulphuric acid and then oxidation of p-nitrosophenol with nitric acid, is characterised in that, in the first nitrosation stage, the concentration of sulphuric acid is at least equal to 60% and, in the second stage, at the end of the oxidation reaction, the concentration of sulphuric acid is at most equal to 80%, which makes it possible to precipitate p-nitrophenol which is then separated.

    PRODUCTION OF 2, 4-DICHLORO-3-ETHYL-6-NITROPHENOL
    202.
    发明专利
    PRODUCTION OF 2, 4-DICHLORO-3-ETHYL-6-NITROPHENOL 失效

    公开(公告)号：JPH03223235A

    公开(公告)日：1991-10-02

    申请号：JP23004090

    申请日：1990-08-30

    Applicant: TAOKA CHEMICAL CO LTD

    Inventor： KIMURA OSAMU ,  HORIKAWA YASUHIKO ,  YAMASHITA MASAYA ,  MORINO KAZUKI ,  KOYAMA SHINICHI

    IPC: B01J27/08 ,  B01J27/125 ,  B01J27/128 ,  C07B61/00 ,  C07C201/10 ,  C07C205/26 ,  C07C303/08 ,  C07C309/02 ,  C07C309/42

    Abstract: PURPOSE:To obtain the title high purity compound industrially and advantageously by sulfonating 4-chloro-3-ethylphenol with chlorosulfonic acid in an organic solvent, chlorinating the reaction product and further nitrating the chlorinated substance with nitric acid. CONSTITUTION:4-Chloro-3-ethylphenol which is not required to separate isomers is sulfonated with chlorosulfonic acid in an organic solvent such as a halogenated hydrocarbon to industrially and advantageously give 5-chloro-4- ethyl-2-hydroxybenzenesulfonic acid. Then this compound is chlorinated in a solvent of acetic acid in the presence of sulfur chloride to industrially and advantageously give 3,5-dichloro-4-ethyl-2-hydroxybenzenesulfonic acid. Further, this compound is nitrated with nitric acid to industrially and advantageously give high-purity 2,4-dichloro-3-ethyl-6-nitrophenol useful as an intermediate for cyano coupler for color photography.

    PRODUCTION OF AROMATIC NITRO COMPOUND
    205.
    发明专利
    PRODUCTION OF AROMATIC NITRO COMPOUND 失效

    公开(公告)号：JPS60123450A

    公开(公告)日：1985-07-02

    申请号：JP22917683

    申请日：1983-12-06

    Applicant: UBE INDUSTRIES

    Inventor： ITAYA HIROSHI ,  KASHIMA MIKITO ,  TAZAKI YASUTAKA

    IPC: C07B43/02 ,  C07B31/00 ,  C07C67/00 ,  C07C201/00 ,  C07C201/10 ,  C07C205/06 ,  C07C205/37

    Abstract: PURPOSE:To obtain the titled compound economically and advantageously in high selectivity, by reacting an aromatic iodine compound with nitrogen dioxide under mild conditions. CONSTITUTION:An aromatic iodine compound, e.g. mono- and diiodinated compound of an alkylbenzene, is reacted with nitrogen dioxide in a solvent, e.g. acetic acid or dichloromethane, at -10-+100 deg.C, preferably 0-60 deg.C to substitute the iodine ions with the nitrogen dioxide ions and give the aimed substance in the manner of position selectivity. The nitrogen dioxide to be used as an oxidizing agent may be accompanied by nitrogen and air, etc. and continuously fed to the reaction system or dissolved in a reaction solvent and dropped with time. The molar amount of the nitrogen dioxide to be used is 2-100 times, preferably 5-50 times of that of the aromatic iodine compound.

    ニトロベンゼン化合物を製造する方法
    207.
    发明专利
    ニトロベンゼン化合物を製造する方法 审中-公开

    公开(公告)号：JPWO2017195619A1

    公开(公告)日：2019-03-14

    申请号：JP2017016700

    申请日：2017-04-27

    Applicant: クミアイ化学工業株式会社

    Inventor： 中村 尊之 ,  加藤 聡 ,  榎本 真希 ,  田藤 淳

    IPC: C07C205/12 ,  C07C205/58 ,  C07C201/10

    Abstract: 本発明の目的は、経済的に好ましくかつ工業化に適した、下記一般式(1)のニトロベンゼン化合物の製造方法を提供することにある。 本発明は、次の一般式(1): (式中、R 1 はハロゲン原子を示し;R 2 、R 3 及びR 4 は水素原子等を示し;R 5 はハロゲン原子又はアルコキシカルボニル基を示す。) のニトロベンゼン化合物の製造方法であって、以下の工程: (i) 一般式(2): (式中、R 1 、R 2 、R 3 、R 4 及びR 5 は前記で定義した通りである。) のアニリン化合物を亜硝酸の金属塩と硝酸の存在下で反応させる工程; (ii) 工程(i)の生成物を亜硝酸の金属塩と銅化合物の存在下で反応させる工程、 を含む方法に関する。

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