1: 70 percent / 48 h / Heating 2: 1.) CCl3F, 2.) Bu4NF / 1.) -78 deg C to 0 deg C, 2.) 25 deg C 3: 12 mg / N-trimethylsilylimidazole / Heating 4: potassium nitrosodisulfonate, KI View Scheme

1: 70 percent / 48 h / Heating 2: 1.) CCl3F, 2.) Bu4NF / 1.) -78 deg C to 0 deg C, 2.) 25 deg C 3: 12 mg / N-trimethylsilylimidazole / Heating View Scheme