| 摘要 |
A process for preparing 4-amino-3-halopicolinic acid of Formula I that can be used as herbicides where: X represents Cl or Br; Y represents H, F, Cl, Br or C1-C4 alkyl ; and R independently represents H or C1-C4 alkyl. The process comprises passing a direct or alternating electric current from an anode to a cathode through a solution of a 4-amino-3,5-dihalopicolinic acid of Formula II where: X, Y and R are as previously defined, and where both of X are either Cl or Br at a cathode potential of -0.4 to -1.7 volts relative to an Ag/AgCl (3.0 M Cl - ) reference electrode and recovering the product, with the proviso that, when X is Cl, Y is not Br.
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