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US 2013/0256148 A1Published application
Silver cathode activation
AssigneeDow AgroSciences LLC
InventorsChen Wang, Scott Lee Haynes, Carey L. Scortichini
Life of this patent
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Abstract
The selective electrochemical reduction of halogenated 4-aminopicolinic acids is improved by activating the cathode at a final potential from about +1.0 to about +1.8 volts.
Claims4
A method for preparing a compound, the method comprising the steps of:
- activating a silver cathode by anodizing the cathode at a final potential in the range of +1.02 to +1.8 volts;
- passing a direct or alternating electric current from an anode to the activated silver cathode through a solution of a 3,5-dihalopyridine or 3,5-dihalopicolinic acid of Formula (II)
- wherein:
- X represents Cl or Br;
- Y represents H, F, Cl, Br or C1-C4 alkyl, with the proviso that when X is Cl, Y is not Br;
- R1 represents Cl or CO2H;
- and
- R2 represents H or NH2;
- and
- forming a 3-halopyridine or 3-halopicolinic acid of Formula I
- wherein:
- X represents Cl or Br;
- Y represents H, F, Cl, Br or C1-C4 alkyl, with the proviso that when X is Cl, Y is not Br;
- R1 represents Cl or CO2H;
- and
- R2 represents H or NH2.
13 more elements
Dependencies are inferred from the claim text.