METHOD FOR PRODUCING 1-SUBSTITUTED 5- OR 3-HYDROXYPYRAZOLES

    公开(公告)号:CA2351370A1

    公开(公告)日:2000-06-02

    申请号:CA2351370

    申请日:1999-11-06

    Applicant: BASF AG

    Abstract: The invention relates to a method for producing 1-substituted 5- and/or 3- hydroxypyrazoles of formulas (I) and (II), wherein R1 represents C1-C6-alkyl , C2-C6-alkenyl, C2-C6-alkinyl, C3-C6-cycloalkyl or C1-C4-alkoxy, whereby thes e groups can be substituted by halogen, C1-C4-alkoxy, phenoxy, C1-C6- alkoxycarbonyl, C1-C6-alkylthiocarbonyl or a cyclic ring system with 3-14 ri ng atoms, by reacting a 3-alkoxyacrylic acid alkyl ester of formula (III), wherein R2, R3 independently mean C1-C6-alkyl or C3-C6-cycloalky, with a hydrazine of formula (IV), wherein R1 has the above cited meaning, a) at a p H value of 6-11 to form 5-hydroxypyrazoles of formula (I), or b) at a pH value of 11-14 to form 3-hydroxypyrazoles of formula (II).

    Method for producing 1-substituted 5- or 3-hydroxypyrazoles

    公开(公告)号:SK286367B6

    公开(公告)日:2008-08-05

    申请号:SK6792001

    申请日:1999-11-06

    Applicant: BASF AG

    Abstract: It is described a method for producing 1-substituted 5- and/or 3-hydroxypyrazoles of formulas (I) and (II), wherein R1 represents C1-C6-alkyl, C2-C6-alkenyl, C2-C6-alkinyl, C3-C6-cycloalkyl or C1-C4-alkoxy, whereby these groups can be substituted by halogen, C1-C4-alkoxy, phenoxy, C1-C6-alkoxycarbonyl, C1-C6-alkylthiocarbonyl or a cyclic ring system with 3-14 ring atoms, by reacting a 3-alkoxyacrylic acid alkyl ester of formula (III), wherein R2, R3 independently mean C1-C6-alkyl or C3-C6-cycloalky, with a hydrazine of formula (IV), wherein R1 has the above cited meaning, a) at a pH value of 6-11 to form 5-hydroxypyrazoles of formula (I), or b) at a pH value of 11-14 to form 3-hydroxypyrazoles of formula (II).

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