Patent ID: 8685222
Filing Date: 2014-04-01
Classification: C07D,C25B

Abstract:
1. An improved process for the preparation of a 3-halopyridine or 3-halopicolinic acid of Formula I wherein X represents Cl or Br; Y represents H, F, Cl, Br or C R R in which a direct or alternating electric current is passed from an anode to a silver cathode through a solution of a 3,5-dihalopyridine or 3,5-dihalopicolinic acid of Formula II wherein X, Y, R wherein both of X are either Cl or Br, at a cathode potential of about −0.4 to about −1.7 volts relative to an Ag/AgCl(3.0 M Cl − ) reference electrode, the improvement characterized by activating the cathode by anodizing the cathode at a final potential of +1.2 volts followed by reverse polarization.