acetic acid; zinc 2 h; Yield given;

electrolysis in THF solution containing (n-Bu)4NClO4 (0.2 mol/dm-3) as supporting electrolyte in an undivided cell with carbon electrods. Electricity 2.2 F*mol-1, constant current 50 mA.;

silver nitrate in water; dimethyl sulfoxide T=110°C; 3 h;