中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

31 records (took 0.031 seconds)

    PROCESS FOR PREPARING DIFLUOROMETHYLPYRAZOLYL CARBOXYLATES
    15.
    发明专利
    PROCESS FOR PREPARING DIFLUOROMETHYLPYRAZOLYL CARBOXYLATES 未知

    公开(公告)号：CA2666746A1

    公开(公告)日：2008-05-08

    申请号：CA2666746

    申请日：2007-11-02

    Applicant: BASF SE

    Inventor： DIETZ JOCHEN ,  KEIL MICHAEL ,  LOHMANN JAN KLAAS ,  ZIERKE THOMAS ,  SMIDT SEBASTIAN PEER ,  RACK MICHAEL ,  GROTE THOMAS ,  RHEINHEIMER JOACHIM ,  SUKOPP MARTIN ,  LOEHR SANDRA

    IPC: C07D237/04 ,  C07F7/04

    Abstract: The present invention relates to a process for preparing difluoromethyl-s ubstituted pyrazol-4-yl carboxylates of the formula (I) in which R1 is C1-C8 -alkyl, C3-C8-cycloalkyl, C1-C4-alkoxy-C1-C4-alkyl, etc.; and R2 is hydrogen , C1-C4-alkyl, benzyl or phenyl, wherein a) a compound of the general formul a (II) in which X is fluorine, chlorine, or bromine, R1 has one of the defin itions given above, and R4 is C1-C8-alkyl, C3-C8-cycloalkyl, C2-C8-alkenyl, benzyl or phenyl, is reacted with a silane compound of the general formula R 3 nSiCl(4-n) in which n is 1, 2 or 3 and the substituents R3 are each indepe ndently selected from C1-C8-alkyl and phenyl, and with a metal which is sele cted from the metals of groups 1, 2, 3, 4 and 12 of the periodic table and h as a redox potential of less than -0.7 V, based on a standard hydrogen elect rode (at 25°C and 101.325 kPa); and b) the reaction mixture from step a) is reacted with a compound of the general formula (III) in which R2 has one of the definitions given above.

Patent Agency Ranking