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    PRODUCTION OF 2,4-DIMETHYLPYRROLE
    1.
    发明专利
    PRODUCTION OF 2,4-DIMETHYLPYRROLE 失效

    公开(公告)号：JP2000178250A

    公开(公告)日：2000-06-27

    申请号：JP35933999

    申请日：1999-12-17

    Applicant: BASF AG

    Inventor： GROENING CARSTEN DR ,  KEMPER REINHARD ,  FREDE MARKUS DR ,  EBEL KLAUS DR

    IPC: C07D207/32 ,  C07D207/323

    Abstract: PROBLEM TO BE SOLVED: To produce 2,4-dimethylpyrrole under much milder conditions of slighter aggressiveness thin well-known conditions according to a conventional technique. SOLUTION: A dicarboxylic acid alkyl ester which is a 2,4-dimethyl-3,5- bisalkoxycarbonylpyrrole is refluxed together with an aqueous solution of an alkali metal hydroxide at 10-30% concentration, advantageously a sodium hydroxide solution until a solid is converted into a solution and the reactional mixture is then neutralized with an acid and further refluxed until the decarbocylation is completed, i.e., the gas evolution is stopped.

    PRODUCTION OF SUBSTITUTED IMIDAZOLE
    2.
    发明专利
    PRODUCTION OF SUBSTITUTED IMIDAZOLE 失效

    公开(公告)号：JPH1087632A

    公开(公告)日：1998-04-07

    申请号：JP22248497

    申请日：1997-08-19

    Applicant: BASF AG

    Inventor： HIEBER GISELA DR ,  EBEL KLAUS DR ,  SCHROEDER JUERGEN DR ,  DOCKNER TONI DR ,  GROENING CARSTEN DR ,  RUGE BERND DR

    IPC: C07D233/58 ,  B01J21/12 ,  B01J27/16 ,  C07D233/54 ,  C07D233/68 ,  C07D233/90 ,  C07D233/91 ,  C07D233/92 ,  C07D235/06 ,  C07D235/08

    Abstract: PROBLEM TO BE SOLVED: To obtain the subject compound useful as a precursor substance or an intermediate for producing dyestuffs, fiber auxiliaries, plastics, etc., by directly using an aqueous imidazole phase obtained on the synthesis of the substituted imidazole. SOLUTION: The aqueous phase of an imidazole compound of formula I (R , R , R are each H, a halogen, NO2 , etc.) is reacted with a compound of the formula: R -O-R (R is a 1-20C hydrocarbon; R is H or R ) in the presence of a catalyst such as the oxide of a metal belonging to the subgroup 4 in the main groups 2, 3, 4 in the periodic table, a phosphate salt, etc., at 220-550 deg.C to produce the substituted imidazole of formula II. The catalyst is used in the form of a fixed bed, and an advantageous catalyst comprises 40-99wt.% of SiO2 and 1-60wt.% of H3 PO4 , or comprises 70-90wt.% of Al2 O3 and 10-30wt.% of SiO2 . Water and the compound of formula I are used in amounts of 99.9-0.1wt.% and 0.1-99.9wt.%, especially advantageously 40-10wt.% and 60-90wt.%, respectively, in the reaction. The reaction temperature is 200-550 deg.C, especially advantageously 280-420 deg.C.

    PRODUCTION OF 2,4-DIMETHY-3,5-BISALKOXYCARBONYLLPYRROLE
    3.
    发明专利
    PRODUCTION OF 2,4-DIMETHY-3,5-BISALKOXYCARBONYLLPYRROLE 失效

    公开(公告)号：JP2000178251A

    公开(公告)日：2000-06-27

    申请号：JP35934099

    申请日：1999-12-17

    Applicant: BASF AG

    Inventor： GROENING CARSTEN DR ,  KEMPER REINHARD ,  FREDE MARKUS DR ,  EBEL KLAUS DR

    IPC: C07D241/06 ,  B01J23/44 ,  C07B61/00 ,  C07D207/34

    Abstract: PROBLEM TO BE SOLVED: To produce a 2,4-dimethyl-3,5-bisalkoxycarbonylpyrrole by enabling operations under milder conditions than those of a conventional technique and avoidance of the formation of by-products. SOLUTION: An alkyl acetoacetate is nitrosated to produce an alkyl 2- nitrosoacetoacetate, which is then reduced with hydrogen in the presence of a noble metal catalyst to form an amine. The resultant amino compound without isolation is condensed in the presence of the corresponding alkyl acetoacetate without undergoing the nitrosation to produce 2,4-dimethyl-3,5- bisalkoxycarbonylpyrrole.

    5.
    发明专利
    未知

    公开(公告)号：DE19803368A1

    公开(公告)日：1999-08-05

    申请号：DE19803368

    申请日：1998-01-29

    Applicant: BASF AG

    Inventor： GROENING CARSTEN DR ,  HESSE MICHAEL DR ,  HEINEKE DANIEL DR ,  KNEUPER HEINZ-JOSEF DR ,  FRITZ GERHARD DR

    IPC: B01J23/89 ,  B01J27/043 ,  B01J27/045 ,  C07D307/28 ,  C07D309/18 ,  C07D507/02 ,  C07D315/00 ,  C07D319/12 ,  C07D321/00

    Abstract: Unsaturated cyclic ethers are produced from diols in high yield and with low hydrogenated byproduct formation, by use of a supported cobalt-noble metal catalyst that has been doped with sulfur. A process for the production of unsaturated cyclic ethers (I) of formula (1) comprises reaction of a diol (II) of formula: OH-CH(R )-Y-CH(R )-CH(R )-OH (2), in the liquid phase at 150-300 degrees C, in the presence of a supported cobalt- containing catalyst (III) that has not been activated by reduction prior to use. The cobalt containing catalyst (III) is impregnated with a noble metal consisting of platinum, palladium, rhodium, iridium, ruthenium, osmium and/or rhenium on an inert carrier that is doped with sulfur. Y = -(CHR )q- or -(CHR )q-O-; R - R = H or 1-4C alkyl; q = 0-3. An Independent claim is also included for the supported cobalt catalyst (III).

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