Process for the preparation of 4-nitro-5-mercaptoimidazoles

    公开(公告)号:DE3718898A1

    公开(公告)日:1988-12-22

    申请号:DE3718898

    申请日:1987-06-05

    Applicant: BASF AG

    Abstract: Preparation of 4-nitro-5-mercaptoimidazoles of the formula I in which the radicals R denotes alkyl, alkoxyalkyl, cycloalkyl, aryl, arylalkyl or alkylaryl; R denotes hydrogen, alkyl, cycloalkyl, aryl, arylalkyl or alkylaryl and R denotes alkyl, cycloalkyl, aryl, arylalkyl, alkylaryl or a heterocyclic or heteroaromatic radical as well as hydrogen or a counterion of the corresponding thiolate where the organic radicals mentioned can still carry inert substituents under the reaction conditions, by reacting dinitroimidazoles of the formula II in which R and R have the abovementioned meaning, with mercapto compounds of the formula III R -SH in which R denotes hydrogen, alkoxyalkyl, alkyl, cycloalkyl, aryl, arylalkyl, alkylaryl or a heterocyclic or heteroaromatic radical, in a solvent or diluent at a pH of at least 4 and isolating the products in a manner known per se.

    77.
    发明专利
    未知

    公开(公告)号:DE3427136A1

    公开(公告)日:1986-02-06

    申请号:DE3427136

    申请日:1984-07-24

    Applicant: BASF AG

    Abstract: Imidazole-4(5)-monocarboxylic acids and their salts or betaines are prepared by reacting an imidazole with carbon dioxide and an alkali metal carbonate, an alkali metal bicarbonate and/or an alkali metal hydroxide at from 140 DEG to 230 DEG C. and under from 2 to 350 bar and, if desired, then reacting the product with an acid. The imidazole-4(5)-monocarboxylic acids which can be prepared by the process of the invention are useful starting materials for the preparation of dyes, crop protection agents and drugs.

    78.
    发明专利
    未知

    公开(公告)号:DE3427404A1

    公开(公告)日:1986-01-30

    申请号:DE3427404

    申请日:1984-07-25

    Applicant: BASF AG

    Abstract: 5,6-Dihydro-2H-thiopyran-3-carboxaldehydes of the formula where R denotes hydrogen or methyl, are prepared by a method in which acrolein or crotonaldehyde is reacted with hydrogen sulfide in a mineral oil whose boiling point is higher than those of the starting materials and of the end product, and the 5,6-dihydro-2H-thiopyran-3-carboxaldehyde is obtained by distillation. These aldehydes are important intermediates for the preparation of some crop protection agents.

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