The electrochemical reduction of some benzyl chlorides at Ag, Hg and carbon electrodes has been studied in CO2-saturated CH3CN + 0.1 M Et4NClO4. Voltammetric investigations, conducted both in the absence and presence of CO2, have shown that Ag has a dramatic electrocatalytic effect on the reduction process. Controlled-potential electrolyses of solutions of the benzyl halides were carried out in an undivided cell with a sacrificial Al anode and a silver cathode. For the sake of comparison, a few experiments were also run at Ag-coated Pt, Hg and graphite cathodes. Although the principal product in all cases was carboxylic acid, the process at Ag takes place at potentials about 0.6 V less negative than at Hg or graphite. Also better current efficiencies (79-95%) are obtained at Ag as compared to Hg or graphite (< 50%).
Silver Cathodes as Electrocatalysts in the Carboxylation of Benzyl Chlorides
AHMED ISSE, ABDIRISAK;GENNARO, ARMANDO
2003
Abstract
The electrochemical reduction of some benzyl chlorides at Ag, Hg and carbon electrodes has been studied in CO2-saturated CH3CN + 0.1 M Et4NClO4. Voltammetric investigations, conducted both in the absence and presence of CO2, have shown that Ag has a dramatic electrocatalytic effect on the reduction process. Controlled-potential electrolyses of solutions of the benzyl halides were carried out in an undivided cell with a sacrificial Al anode and a silver cathode. For the sake of comparison, a few experiments were also run at Ag-coated Pt, Hg and graphite cathodes. Although the principal product in all cases was carboxylic acid, the process at Ag takes place at potentials about 0.6 V less negative than at Hg or graphite. Also better current efficiencies (79-95%) are obtained at Ag as compared to Hg or graphite (< 50%).Pubblicazioni consigliate
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