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    101.
    发明专利
    未知

    公开(公告)号：DE59206187D1

    公开(公告)日：1996-06-05

    申请号：DE59206187

    申请日：1992-01-31

    Applicant: HOECHST AG

    Inventor： FOLZ GEORG ,  PAPENFUHS THEODOR

    IPC: B01J27/128 ,  C07B61/00 ,  C07C303/22 ,  C07C313/04 ,  C07C315/00 ,  C07C317/14

    Abstract: Process for the preparation of 4-alkylsulfonyl-1-alkyl-2-chlorobenzenes and like compounds.A process for the preparation of 4-alkyl(C1-C4)-sulfonyl-1-alkyl-2-chlorobenzenes, in very good yields and with high selectivity by selectively chlorinating a p-alkyl-benzenesulfonyl chloride with gaseous chlorine in the presence of a chlorine carrier at 50° C. to 100° C. to give a compound of the formulain which R1 is an alkyl (C1-C4) group, subsequently reducing the latter in an aqueous medium at a pH of 8 to 10 with sodium hydrogen sulfite or sodium sulfite at 40 to 90° C. to give a compound of the formulaand reacting the latter with alkyl(C1-C4) chloride in the presence of an acid binder at 80 to 150° C., and also compounds of the last mentioned formula which, instead of the -SO2Na group contain the -SO2X group (X=hydrogen atom or alkali metal atom).

    102.
    发明专利
    未知

    公开(公告)号：DE59106058D1

    公开(公告)日：1995-08-24

    申请号：DE59106058

    申请日：1991-09-25

    Applicant: HOECHST AG

    Inventor： PAPENFUHS THEODOR ,  HACKENBRUCH JOACHIM ,  PFIRMANN RALF DR

    IPC: B01J23/02 ,  C07B61/00 ,  C07C201/12 ,  C07C205/26

    Abstract: PCT No. PCT/EP91/01829 Sec. 371 Date Mar. 23, 1993 Sec. 102(e) Date Mar. 23, 1993 PCT Filed Sep. 25, 1991 PCT Pub. No. WO92/05141 PCT Pub. Date Apr. 2, 1992.According to a process for producing isomer-free 2,3-difluoro-6-nitrophenol, 2,3,4-trifluoronitrobenzene is reacted with an aqueous solution of alkali metal or alkaline earth metal hydroxide in the absence of organic solvent, at temperatures between about 20 degrees C. and 100 degrees C., the pH value of the reaction mixture is set at about 1 to 6 by acid addition, the resulting product is stream distilled and the 2,3-difluoro-6-nitrophenol is isolated after cooling. No organic solvents are used during any of the steps of the process.

    PROCESS FOR THE PREPARATION OF 4-ALKOXY-3,5,6-TRIFLUOROPHTHALIC ACIDS AND 3-ALKOXY-2,4,5-TRIFLUOROBENZOIC ACIDS
    103.
    发明专利
    PROCESS FOR THE PREPARATION OF 4-ALKOXY-3,5,6-TRIFLUOROPHTHALIC ACIDS AND 3-ALKOXY-2,4,5-TRIFLUOROBENZOIC ACIDS 未知

    公开(公告)号：CA2142255A1

    公开(公告)日：1995-08-13

    申请号：CA2142255

    申请日：1995-02-10

    Applicant: HOECHST AG

    Inventor： PFIRMANN RALF ,  PAPENFUHS THEODOR

    IPC: C07C51/367 ,  C07C51/38 ,  C07C65/21 ,  C07C67/31

    Abstract: The present invention relates to a process for the preparation of 4-alkoxy-3,5,6-trifluorophthalic acids of the formula (1), in which R is an alkyl radical having 1 to 5 carbon atoms which may be monofluorinated or polyfluorinated, a cycloalkyl radical having 3 to 5 carbon atoms in the ring which may be monofluorinated or polyfluorinated, or an araliphatic radical which may be monofluorinated or polyfluorinated, or, if desired, of 3-alkoxy-2,4,5-trifluorobenzoic acids of the formula (2), in which R is as defined above, which involves reacting tetrafluorophthalic acid or tetrafluorophthalic anhydride with an alcohol of the formula ROH in which R is as defined above and with a water-soluble base in water at elevated temperature, isolating the 4-alkoxy-3,5,6-trifluorophthalic acid formed and, if desired, decarboxylating the 4-alkoxy-3,5,6-trifluorophthalic acid in the presence of a basic solvent and, if desired, of an inert solvent at from 70 to 180.degree.C, and isolating the 3-alkoxy-2,4,5-trifluorobenzoic acid formed.

    4-alkyl-3-chlorobenzenesulfinic acids, 4-alkyl-3- chlorobenzenesulfonylcarboxylic acids, 4-alkyl-3- chloroalkylsulfonylbenzenes and preparation thereof
    108.
    发明专利
    4-alkyl-3-chlorobenzenesulfinic acids, 4-alkyl-3- chlorobenzenesulfonylcarboxylic acids, 4-alkyl-3- chloroalkylsulfonylbenzenes and preparation thereof 未知

    公开(公告)号：AU5923994A

    公开(公告)日：1994-10-06

    申请号：AU5923994

    申请日：1994-03-31

    Applicant: HOECHST AG

    Inventor： FOLZ GEORG ,  PAPENFUHS THEODOR

    IPC: C07C313/04 ,  C07C315/00 ,  C07C315/04 ,  C07C317/14 ,  C07C317/44 ,  C07C313/02

    Abstract: Process for the preparation of 4-alkyl-3-chloroalkylsulphonylbenzenes of the formula (1) in which R and R are identical or different and denote (C1-C4)-alkyl, by chlorinating p-alkylbenzenesulphonyl chloride of the formula (2) in which R has the abovementioned meaning, with at least one mole of chlorine in the presence of a chlorine donor at temperatures of approximately 50 to approximately 100@C to give a compound of the general formula (3) in which R has the abovementioned meaning, and this compound is subsequently reduced using sodium hydrogen sulphite or sodium sulphite in an aqueous medium at temperatures of approximately 40 to approximately 90@C to give a compound of the general formula (4) in which R has the abovementioned meaning, and this compound is subjected to a condensation reaction with an alpha -halocarboxylic acid of the general formula (5) in which R is hydrogen or (C1-C3)-alkyl and X is bromine or chlorine, or one of its salts, to give a 4-alkyl-3-chlorobenzenesulphonylcarboxylic acid of the general formula (6) in which R and R have the abovementioned meaning, or one of its salts, and this compound is subsequently decarboxylated by heating. The invention furthermore relates to compounds of the formula (1) in which R is (C1-C4)-alkyl and R is (C2-C4)-alkyl or R is (C2-C4)-alkyl and R is (C1-C4)-alkyl, and to compounds of the formula (4) in which R is (C1-C4)-alkyl, and to compounds of the formula (6) in which R is hydrogen or (C1-C3)-alkyl and R is (C1-C4)-alkyl, and to the corresponding alkali metal salts.

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