Summary The effect of several classes of supporting electrolytes on the electroreduction of ethyl bromide in propylenes carbonate at lead cathodes has been examined. Tetraethyllead is formed only in presence of onium salts, while with inorganic salts only hydrocarbon discharge takes place. The action of onium ions and solvent molecules on the EtBr, electrode behaviour pattern is discussed with reference to similar phenomena, such as the acrylonitrile electro-hydrodimerization.
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