dicyclohexyl-carbodiimide in dichloromethane T=0°C; 0.25 h;

1: 48 percent / diethyl ether; cyclohexane / 0.17 h / 0 °C 2: 88 percent / 3-chloroperoxybenzoic acid / CHCl3 / 3 h / Ambient temperature View Scheme

in acetic acid; acetonitrile Kolbe-type electrolysis, Pt electrodes, undivided cell;