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Process for the electrochemical oxidation of organic products
| Details |
Inventors: Thomas, Andreas M. J.; van den Brink, Franciscus; van Hardeveld, Rudolf;
Assignee: Stamicargon B. V. (Geleen, NL)
Primary Examiner: Andrews; R. L.
Assistant Examiner:
Attorney, Agent or Firm: Cushman, Darby & Cushman
The invention relates to a process for the electrochemical oxidation of organic products at a lead-silver anode in acid medium, in which process the organic products used are alkyl-substituted heterocycles and in which process a lead-silver anode with 2-10% (wt) silver is used. |
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DETAILED DESCRIPTION We claim: 1.
Process for the electrochemical oxidation of organic products at a lead-silver anode in acid medium, characterized in that the organic products used are alkyl-substituted heterocycles and that a lead-silver anode is used with 2-10% (wt) silver.
2.
Process according to claim 1, characterized in that the anode contains 2.
6-8% (wt) silver.
3.
Process according to claim 1, characterized in that the anode also contains one or more of the metals antimony, cadmium, calcium, cobalt, tellurium, thorium, tin or zinc in an amount of 0.
01-0.
7% (wt).
4.
Process according to claim 1, characterized in that the acid used is sulphuric acid or phosphoric acid.
5.
Process according to claim 1, characterized in that a current density of 100-10,000 A/m.
sup.
2 is applied.
6.
Process according to claim 1, characterized in that the alkyl-substituted heterocycles used are mono and dimethylsubstituted pyridines.
7.
Process according to claim 6, characterized in that the organic product used is 2,3-lutidine.
8.
Process according to claim 1, characterized in that the electrochemical oxidation is carried out at a temperature between 20.
degree.
-90.
degree.
C.
Description:
The invention relates to a process for the electrochemical oxidation of organic products at a lead-silver anode in an acid medium.
Such a process is known from the handbook `Elektroorganische Chemie, Grundlagen und Anwendungen` by F.
Beck, published by Verlag Chemie, 1974, page 99.
It has been known for a much longer time that in such oxidation reactions lead electrodes have been used.
It should otherwise be noted that under operating conditions the lead of the anode is oxidized at least in part to form lead dioxide.
To such a lead electrode sometimes up to 1% (wt) silver was added in order to come to a greater stability in acid medium.
Besides, low concentrations of other elements were sometimes added, again to increase the corrosion stability (see e.
g.
M.
M.
Baizer, `Organic Electrochemistry An Introduction and a Guide`, 1973, Marcel Dekker (New York), p
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