中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

156 records (took 0.024 seconds)

    PRODUCTION OF SUBSTITUTED IMIDAZOLE
    1.
    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.

    2.
    发明专利
    未知

    公开(公告)号：DE19757711A1

    公开(公告)日：1999-07-01

    申请号：DE19757711

    申请日：1997-12-23

    Applicant: BASF AG

    Inventor： MOHR JUERGEN DR ,  DOCKNER TONI DR

    IPC: C07C31/20 ,  C07C29/10 ,  C07C29/80 ,  C07C29/94

    Abstract: The invention relates to a method for obtaining alkylene glycol with a low aldehyde content. According to said method, a mixture containing alkylene glycol is subjected to a definitive distillation process, said mixture containing formic acid or a formiate or a mixture of two or more formiates or a mixture of formic acid and one or more formiates.

    Process for the preparation of 4-nitroimidazol-5-yl ethers
    9.
    发明专利
    Process for the preparation of 4-nitroimidazol-5-yl ethers 未知

    公开(公告)号：DE3729406A1

    公开(公告)日：1989-03-16

    申请号：DE3729406

    申请日：1987-09-03

    Applicant: BASF AG

    Inventor： KOEHLER HERMANN DR ,  DOCKNER TONI DR

    IPC: C07D233/92 ,  C07D401/12 ,  C07D473/38

    Abstract: The invention relates to a process for the preparation of 4-nitroimidazol-5-yl) ethers of the formula I in which R is alkyl, alkoxyalkyl, cycloalkyl, aryl, alkylaryl or arylalkyl, R is hydrogen, alkyl, cycloalkyl, aryl, arylalkyl or alkylaryl and R is alkyl, cycloalkyl, aryl, arylalkyl, alkylaryl or a heterocyclic radical and it still being possible for R to R to carry substituents which are inert under the reaction conditions, which is characterised in that dinitroimidazoles of the formula II in which R and R have the abovementioned meaning, are reacted with oxygen compounds of the formula III R -OH in which R has the abovementioned meaning, in a solvent or diluent at a pH of >/= 6 and the products are isolated in a known manner. The compounds which can be prepared according to the invention are useful intermediates.

Patent Agency Ranking