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    Production of 3-amino-2,1-benzoisothiazoles
    11.
    发明专利
    Production of 3-amino-2,1-benzoisothiazoles 未知

    公开(公告)号：GB1115780A

    公开(公告)日：1968-05-29

    申请号：GB4316365

    申请日：1965-10-12

    Applicant: BASF AG

    Inventor： SEEFELDER MATTHIAS ,  ARMBRUST HERBERT

    IPC: C07D275/04

    Abstract: The invention comprises 3-amino-2,1-benzoisothiazoles of the formula where X and Y are the same or different and represent alkyl, alkoxy, nitro, primary amino or halogen groups and, when Y is nitro or amino, X may denote hydrogen. The compounds are made by reacting o-aminothiobenzamides of the formula with a two-equivalent oxidizing agent or oxidation potential is greater than 0.6 volt in the presence of an inert solvent or suspension media at - 20 DEG to +150 DEG C. Specified oxidizing agents are hydrogen peroxide, Caro's acid, persulphuric, peracetic, perchloric and perboric acids, bromine, chlorine, sulphuryl chloride, sulphur dichloride, chromic acid, ozone, hypochlorous, perphthalic and perbenzoic acids. If a strong acid is used as solvent or oxidizing agent, the product is obtained in the form of a salt which is treated with alkaline reagent to liberate the free base. Examples relate to the preparation of 5,7-dibromo-, 5-nitro-, and 5-nitro-7-bromo-3amino -2,1-benzoisothiazoles and 3,5-diamino2,1-benzoisothiazole. The thioamides of Formula II used as starting materials may be made by reacting the corresponding o-aminobenzonitriles with hydrogen sulphide in the presence of ammonia. Examples describe the preparation of 3,5-dibromo- and 5-amino-anthranilic thioamide and 2-amino-3-bromo -5-nitrothiobenzamide. 2,5-Diaminobenzonitrile is prepared by reducing 5-nitro-2-aminobenzonitrile with Raney nickel and hydrazine.

    New azo dyes
    12.
    发明专利
    New azo dyes 未知

    公开(公告)号：GB1112146A

    公开(公告)日：1968-05-01

    申请号：GB2572266

    申请日：1966-06-09

    Applicant: BASF AG

    Inventor： SEEFELDER MATTHIAS ,  WIPPEL HANS GUENTER ,  DEHNERT JOHANNES ,  ARMBRUST HERBERT

    IPC: C09B44/20

    Abstract: The invention comprises dyes of the formulae and where A is an amine or enamine radical, R is an alkyl radical which may be substituted, X-is an anion and ring B may bear nonionic substituents. The compounds are prepared by diazotizing a 3 - amino - 2,1 - isobenzothiazole, coupling with a compound of the formula AH, and alkylating if desired.

    Production of 4,5-dihydrouracil
    15.
    发明专利
    Production of 4,5-dihydrouracil 未知

    公开(公告)号：GB985157A

    公开(公告)日：1965-03-03

    申请号：GB3591663

    申请日：1963-09-12

    Applicant: BASF AG

    Inventor： SEEFELDER MATTHIAS ,  REPPE HANS-GERHARD

    Abstract: 4,5-Dihydrouracil is produced by reacting acrylic acid with urea in sulphuric acid as solvent, at a temperature between 100 DEG and 250 DEG C., diluting the reaction mixture with water and separating the 4,5-dihydrouracil. The sulphuric acid may be of 90 to 100% concentration by weight and the ratio by weight of sulphuric acid to urea is between 2: 1 and 1: 1. The ratio by weight of acrylic acid and urea may be between 0.2: 1 and 1: 1. Air is preferably excluded from the reaction which is carried out at a pressure of 0.5 to 10 atmospheres gauge, either by the intrinsic reaction pressure or by using inert gases, e.g. nitrogen or nitrogen monoxide.

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