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    12.
    发明专利
    未知

    公开(公告)号：DE59303534D1

    公开(公告)日：1996-10-02

    申请号：DE59303534

    申请日：1993-04-01

    Applicant: HOECHST AG

    Inventor： ROEHRSCHEID FREIMUND DR

    IPC: C07B61/00 ,  C07C2/68 ,  C07C2/70 ,  C07C2/86 ,  C07C5/333 ,  C07C15/02 ,  C07C15/16 ,  C07C15/44 ,  C07C17/08 ,  C07C22/04

    Abstract: Dixylylpropane is obtained in a multi-step process, inter alia via 1,2-dimethyl-4-( alpha -chloroisopropyl)benzene, which has not been known to date, o-xylene and propene, both of which are readily accessible compounds, being used as starting compounds. The process gives the desired compound in high yields and isomeric purity and is distinguished by the fact that only a small amount of by-products is obtained. The desired compound is therefore particularly suitable for problem-free processing.

    13.
    发明专利
    未知

    公开(公告)号：DE59200677D1

    公开(公告)日：1994-12-01

    申请号：DE59200677

    申请日：1992-03-23

    Applicant: HOECHST AG

    Inventor： ROEHRSCHEID FREIMUND DR

    IPC: B01J27/08 ,  B01J27/128 ,  B01J31/04 ,  C07B61/00 ,  C07C315/04 ,  C07C317/44

    Abstract: A process for the preparation of alkanesulfonylbenzoic acids from alkanesulfonylalkylbenzenes of the formula I in which R1 and R2 are identical or different and are alkyl having 1 to 4 carbon atoms, but R2 has a meaning other than t-butyl, and X is H, F, Cl, Br or NO2, using molecular oxygen in acetic acid and/or propionic acid in the presence of a catalyst containing cobalt and bromine ions and, in particular when the meaning of R2 is other than methyl, also manganese ions, which is additionally carried out in the presence of metal ions of Main Group 2 and/or 3.

    14.
    发明专利
    未知

    公开(公告)号：DE58908518D1

    公开(公告)日：1994-11-24

    申请号：DE58908518

    申请日：1989-07-28

    Applicant: HOECHST AG

    Inventor： ROEHRSCHEID FREIMUND DR

    IPC: C07D307/89 ,  C07C63/72 ,  C07D493/04 ,  C08G73/10

    Abstract: A process for the preparation of high-purity perfluorinated compounds, specifically of an aromatic tetracarboxylic acid and its anhydride, 5,5'-[2,2,2-trifluoro-1-(trifluoromethyl)-ethylidene]bis-1,3-isobenzof urandione, by a multi-step treatment of the crude compounds. The metal ion content of the compounds treated is reduced considerably. After polymerization with an aromatic diamine, the anhydride is used in microelectronics.

    18.
    发明专利
    未知

    公开(公告)号：DE3525848A1

    公开(公告)日：1987-01-22

    申请号：DE3525848

    申请日：1985-07-19

    Applicant: HOECHST AG

    Inventor： ROEHRSCHEID FREIMUND DR

    IPC: C07C47/565 ,  C01G37/02 ,  C01G45/02 ,  C01G51/04 ,  C01G53/04 ,  C07C45/00 ,  C07C45/36 ,  C07C45/78 ,  C07C45/79 ,  C07C45/80 ,  C07C45/81 ,  C07C45/82 ,  C07C67/00

    Abstract: The invention relates to a process for the isolation of p-hydroxybenzaldehyde from the reaction mixture obtained by oxidizing p-cresol with oxygen or oxygen-containing gases in methanol in the presence of Na or K hydroxide and an Mn, Ni, Cr or Co salt. The procedure in this process is optionally to add water to the reaction mixture, to heat the resulting solution and to filter off the precipitated Mn, Ni, Cr or Co oxide-hydrate, to remove the methanol from the filtrate by distillation, to cool the residual aqueous solution and thus to allow the p-hydroxybenzaldehyde to crystallize out in the form of the Na or K salt. Alternatively, the reaction mixture is first dried by atomization, the soluble constituents of the dry substance are then dissolved in hot water, the undissolved Mn, Ni, Cr or Co oxide-hydrate is filtered off and the salt of p-hydroxybenzaldehyde is again allowed to crystallize out by cooling the filtrate. A further method consists in diluting the reaction mixture with methanol, filtering off the undissolved Mn, Ni, Cr or Co oxide-hydrate, drying the filtrate by atomization, dissolving the resulting dry substance in hot water, and again allowing the p-hydroxybenzaldehyde to crystallize out as the Na or K salt by cooling the solution.

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