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    Imidazole derivs. prodn. - by reacting 1,2-di:amine with carboxylic acid or dehydrogenating imidazoline in presence of zinc oxide
    12.
    发明专利
    Imidazole derivs. prodn. - by reacting 1,2-di:amine with carboxylic acid or dehydrogenating imidazoline in presence of zinc oxide 未知

    公开(公告)号：DE2728976A1

    公开(公告)日：1979-01-18

    申请号：DE2728976

    申请日：1977-06-28

    Applicant: BASF AG

    Inventor： DOCKNER TONI DIPL CHEM DR ,  FRANK ANTON ,  KRUG HERBERT

    IPC: C07D233/54 ,  C07D233/58

    Abstract: Prodn. of imidazoles of formula (I) comprises (a) reacting 1,2-diamines of formula (II) with carboxylic acids of formula (III) or (b) dehydrogenating 2-imidazolines of formula (IV), in either case by heating at 300-600 degrees C in the presence of zinc oxide or a mixt. of zinc oxide and aluminium oxide as catalyst: (R1 - R4 = H or an aliphatic, araliphatic, cycloaliphatic or aromatic residue). (I) are intermediates for dyes, plant protection agents, textile aids, polyurethane and epoxy resin catalysts, surfactants and pharmaceuticals (e.g. nitroimidazoles). They can also be used as catalysts for polymerisations and aldol condensations. (I) is obtd. in good yields and purity. The catalysts used are cheap and easily regenerated, and are not significantly poisoned after prolonged use.

    (2)-Imidazolines prepn. - from an alkyl carboxylic acid and excess diamine with continuous removal of the water formed
    13.
    发明专利
    (2)-Imidazolines prepn. - from an alkyl carboxylic acid and excess diamine with continuous removal of the water formed 未知

    公开(公告)号：DE2615886A1

    公开(公告)日：1977-10-20

    申请号：DE2615886

    申请日：1976-04-10

    Applicant: BASF AG

    Inventor： DOCKNER TONI DIPL CHEM DR ,  FRANK ANTON

    IPC: C07D233/06 ,  C07D233/10

    Abstract: Prepn. of 2-imidazolines of formula (I): (where R1 and R2 are each H or an aliphatic gp) comprises reacting a 1,2-diamine of formula (II) NH2-CH2-CH(NH2)R2 (II) with an alkyl carboxylic acid R1COOH (III) in molar ratio at least 2:1 at less than 160 degrees C and with continuous removal of water by distn. In an example 740 pts. wt. diaminopropane and 370 pts. wt. propionic acid gave 456 pts. wt. (95.4% yield) 2-ethyl-4-methyl imidazoline m.pt. 114 degrees C 180 pts. wt. water were distd. off over 12.5 hr. (I) are intermediates in the synthesis of dyes, plant protecting agents and pharmaceticals. (I) are polymerisation catalysts and catalysts for the aldol condensn. Dehydration in the presence of Al/ZnO catalysts gives the corresp. imidazole. (I) are obtd. in high yield and purity obviating the necessity for cumbersome multi-stage purificns. Decompsn. products, complex cpds. and high-boiling by-products are not formed in significant amts. The reaction temp. is low of previous processes.

    14.
    发明专利
    未知

    公开(公告)号：DE2414280A1

    公开(公告)日：1975-10-23

    申请号：DE2414280

    申请日：1974-03-25

    Applicant: BASF AG

    Inventor： FRANK ANTON ,  KARN HELMUT ,  DOCKNER TONI DIPL CHEM DR

    IPC: C07D233/92

    Abstract: 1-Alkyl-5-nitroimidazoles are prepared by reacting a 5-nitroimidazole with an alkylating agent in the presence of an aliphatic carboxylic acid. The products are intermediates for the production of dyes, textiles auxiliaries and insecticides.

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