中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

706 records (took 0.023 seconds)

    311.
    发明专利
    失效

    公开(公告)号：JP3297198B2

    公开(公告)日：2002-07-02

    申请号：JP11308994

    申请日：1994-05-26

    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.

    METHOD FOR PRODUCING NITROSOBENZENE
    313.
    发明专利
    METHOD FOR PRODUCING NITROSOBENZENE 失效

    公开(公告)号：JP2001139526A

    公开(公告)日：2001-05-22

    申请号：JP2000343509

    申请日：2000-11-10

    Applicant: BAYER AG

    Inventor： GIERA HENRY ,  MEIERS MICHAELA ,  HUGGER UWE

    IPC: C07C201/06 ,  C07B61/00 ,  C07C201/00 ,  C07C205/06 ,  C07C207/02 ,  C07C207/04

    Abstract: PROBLEM TO BE SOLVED: To provide a method for producing a nitrosobenzene of the formula [R1 and R2 are each the same or different and hydrogen atom, a 1-4C alkyl or a 1-4C alkoxy] by oxidation of a corresponding aromatic amine. SOLUTION: The oxidation is carried out by using hydrogen peroxide in the presence of a tungsten compound-based and/or a molybdenum compound- based oxidation catalyst at 5-25 deg.C without using an organic solvent in the ratio of (aromatic amine):(hydrogen peroxide):(oxidation catalyst) of 1:(2.0-5.0):(0.001-0.05).

    NITRATION OF ACETOPHENONE DERIVATIVE
    314.
    发明专利
    NITRATION OF ACETOPHENONE DERIVATIVE 失效

    公开(公告)号：JPH08259507A

    公开(公告)日：1996-10-08

    申请号：JP6571995

    申请日：1995-03-24

    Applicant: NISSAN CHEMICAL IND LTD

    Inventor： SUZUKI HIDEO ,  SUZUKI HITOMI

    IPC: B01J27/04 ,  B01J27/128 ,  C07B61/00 ,  C07C201/06 ,  C07C205/45

    Abstract: PURPOSE: To nitrate acetophenone derivative useful as an intermediate for organic chemicals such as pharmaceuticals in high reaction rate and yield by using an extremely small amount of a metal and/or a metal compound or an inorganic acid. CONSTITUTION: (A) An acetophenone derivative the formula (R to R are each H or a halogen; at least one of R to R is a halogen; R is H, a halogen, an alkyl, amino or an alkoxy; (n) is 1-4) (e.g. acetophenone) is nitrated with (B) oxygen or air containing a nitrogen oxide and ozone by using a catalyst consisting of (C) a metal (preferably at least one kind of metal selected from among transition metals, tin, antimony, lead and bismuth, especially iron) and/or a compound of the metal or (D) an inorganic acid (preferably sulfuric acid and/or sulfur trioxide).

    PRODUCTION OF 1-NITROANTHRAQUINONES
    317.
    发明专利
    PRODUCTION OF 1-NITROANTHRAQUINONES 失效

    公开(公告)号：JPH02311445A

    公开(公告)日：1990-12-27

    申请号：JP13020589

    申请日：1989-05-25

    Applicant: NIPPON CATALYTIC CHEM IND

    Inventor： SUGISHIMA NOBORU ,  IKEDA NORIAKI ,  FUJII YASUSHI ,  INOUE AKIRA

    IPC: C07C201/06 ,  C07C205/47 ,  C07C239/14 ,  C25B3/02

    Abstract: PURPOSE:To obtain the subject compound in high selectivity, yield and purity with simple operation under mild reaction condition by reacting 5-nitro-1,4,4a,9a- tetrahydroanthraquinones in the presence of the basic compound and oxidizing the reaction product. CONSTITUTION:A 5-nitro-1,4,4a,9a-tetrahydroanthraquinone compound of formula I (R and R are H, 1 to 4C alkyl or halogen) is reacted in the presence of a metallic basic compound of group Ia, Ib, IIa, IIb, etc., of the periodic table and the obtained compound of formula II is oxidized in the presence of a metallic basic compound of group Ia, Ib, IIb, etc., of the periodic table to obtain the objective compound of formula III useful as a raw material for 1- aminoanthraquinones, intermediate for dye or pigment, etc. The basic solution left after separation of the objective compound can be recycled. The separation of the product and the treatment of waste water can easily be carried out without causing environmental pollution. The objective compound can be produced at a low cost and the present process is advantageous from industrial viewpoint.

    METHOD FOR NITRATING TRI-M-CRESYL PHOSPHATE
    319.
    发明专利
    METHOD FOR NITRATING TRI-M-CRESYL PHOSPHATE 失效

    公开(公告)号：JPS62277346A

    公开(公告)日：1987-12-02

    申请号：JP231087

    申请日：1987-01-08

    Applicant: SUMITOMO CHEMICAL CO

    Inventor： OSU MOTOMASA ,  SHIMIZU KATSUNOSUKE ,  KAMEMOTO KOICHI ,  KAWAGUCHI MINEO

    IPC: C07F9/12 ,  C07C67/00 ,  C07C201/00 ,  C07C201/06 ,  C07C205/20 ,  C07C205/22 ,  C07F9/09

    Abstract: PURPOSE:To obtain a nitrated substance useful as an intermediate for synthesizing insecticides in high yield and in high selectivity without using a large amount of sulfuric acid, by reacting tri-m-cresyl phosphate with a specific amount of a mixed acid of nitric acid and sulfuric acid, and hydrolyzing. CONSTITUTION:A mixed acid consisting of 3.0-3.5 times as much as concn. nitric acid as tri-m-cresyl phosphate by molar quantity and 2.4-4.0 times as much conc. sulfuric acid as the concn. nitric acid by weight and tri-m-cresyl phosphate are dripped into an inert solvent such as dichloroethane, etc., for 1-4hr and tri-m-cresyl phosphate is nitrated at 5-30 deg.C. Then, the nitrated substance is hydrolyzed to give 3-methyl-4-nitrophenol. The amount of the inert solvent used is 0.3-2.0 times as much as the cresyl phosphate by weight.

Patent Agency Ranking