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146 records (took 0.024 seconds)

    46.
    发明专利
    未知

    公开(公告)号：ES2075229T3

    公开(公告)日：1995-10-01

    申请号：ES91101833

    申请日：1991-02-09

    Applicant: BASF AG

    Inventor： ZIMMERMANN HORST DR ,  BRENNER KARL ,  SCHEIPER HANS-JURGEN ,  SAUER WOLFGANG DR ,  HARTMANN HORST

    IPC: C07D307/08 ,  C07D307/32 ,  C07D307/33 ,  C07D315/00

    Abstract: Process for the preparation of THF or of THF and gamma -butyrolactone from the hydrogenation product of the hydrogenation of maleic acid, succinic acid, maleic anhydride, succinic anhydride and/or fumaric acid by treating the crude hydrogenation product without prior workup at 100 to 300 DEG C with proton acids and isolating pure tetrahydrofuran and gamma -butyrolactone from the reaction mixture obtained by distillation.

    Prepn. of O-Phenoxy-oximes and hydroxyl-ammonium salts
    48.
    发明专利
    Prepn. of O-Phenoxy-oximes and hydroxyl-ammonium salts 未知

    公开(公告)号：DE4415887A1

    公开(公告)日：1995-06-01

    申请号：DE4415887

    申请日：1994-05-05

    Applicant: BASF AG

    Inventor： RANG HARALD DR ,  GOETZ NORBERT DR ,  HARREUS ALBRECHT DR ,  BORCHERS DIRK DR ,  MAYWALD VOLKER DR ,  HEIMANN FRANK DR ,  BUSCHULTE THOMAS DR ,  HARTMANN HORST

    IPC: B01J23/02 ,  B01J31/02 ,  C07B61/00 ,  C07C239/20 ,  C07C249/12 ,  C07C251/54 ,  C07C309/66 ,  C07C309/04

    Abstract: A process is disclosed for producing isomer mixtures from O-phenoxyalkylhydroxyl amines Ia: H2N-O-CH2-CH(R )-O-Ar and Ib: H2N-O-CH(R )-CH2-O-Ar (wherein R represents alkyl, Ar where appropriate a substituted phenyl) and the corresponding salt mixtures. This process involves the following steps: (a) an isomer mixture of O-(2-hydroxyethyl)-oximes (IIa) and (IIb) (in which R is an alkyl and R is an alkyl or alkoxy, or R and R together with the common C atom form a 5-7 member ring) is converted by reaction with a sulphonyl halogenide of formula (III): Hal-SO2-R (wherein R represents an organic group and Hal is a halogen) in the presence of a base to form the corresponding sulphonate mixture of (IVa) and (IVb); (b) this sulphonate mixture is reacted in the presence of a base with a phenol of formula (V): HO-Ar to produce a mixture of O-phenoxyalkyloximes of general formulae (VIa) and (VIb); (c) the mixture is hydrolysed in the presence of an acid and, if required, (d) the O-phenoxyalkylhydroxyl amines (Ia) and (Ib) are released from the resulting salts using a mineral base. The O-phenoxyalkylhydroxyl amines (Ia/Ib) and their precursors (VIa/VIb) are important intermediate products for plant protective agents and drugs.

    Phenyl N-methyl:carbamate prodn. - by heating corresp. alkyl ester with phenol in inert liq. in presence of Lewis acid, with continuous distn of alkanol
    50.
    发明专利
    Phenyl N-methyl:carbamate prodn. - by heating corresp. alkyl ester with phenol in inert liq. in presence of Lewis acid, with continuous distn of alkanol 未知

    公开(公告)号：DE4022605A1

    公开(公告)日：1991-01-31

    申请号：DE4022605

    申请日：1990-07-16

    Applicant: BASF AG

    Inventor： LUKSZA MICHAEL DR ,  HARTMANN HORST

    IPC: C07C271/44

    Abstract: Phenyl N-methylcarbamate of formula MeNH-COO-Ph (I) is produced by reaction of the corresp. (1-4C alkyl)-ester (II) with phenol in the liq. phase at elevated temp. in the presence of a Lewis acid catalyst, with continuous distillation of the alcohol ROH from the reaction mixt. Catalyst is pref. Ti(OEt)4, Ti(OPh)4, Ti(OPr)4, Al(OPr)3, Bu2Sn(OMe)2 or Bu2SnO. Reaction is carried out at 100-200 deg.C and 0.02-1 bar in the presence of an inert solvent, pref. 1,2-dichlorobenzene (DCB). Excess phenol is used, and mol. ratio (II):Lewis acid = (10:1)-(100:1). USE/ADVANTAGE - (I) is useful as a blocked methyl isocyanate (III), which releases the highly toxic (III) by thermal cleavage immediately before use. A simple and safe process for the prodn. of (I).

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