Heating; Yield given;

1: 71 percent / CHCl3 / 24 h / Ambient temperature 2: 74 percent / CH3OH / pentane / 12 h / -78 °C 3: CDCl3 / -60 deg C to room temp. in 30 to 60 s 4: 15 percent / triethylamine View Scheme

1: 71 percent / CHCl3 / 24 h / Ambient temperature 2: 74 percent / CH3OH / pentane / 12 h / -78 °C 3: CDCl3 / -60 deg C to room temp. in 30 to 60 s 4: trimethylamin View Scheme

tetra-n-butylammonium perchlorate in acetonitrile T=0°C; electrochemical oxidation;