1: 97 percent / dimethylformamide / 72 h / Ambient temperature 2: 1) diisopropylamine, butyllithium / 1) THF, hexane, -80 deg C, 15 min, 2) 16h View Scheme

n-butyllithium; diisopropylamine 1) THF, hexane, -80 deg C, 15 min, 2) 16h; Yield given. Multistep reaction;

sodium hydrogencarbonate; 3-chloro-benzenecarboperoxoic acid in dichloromethane T=0°C; 14 h;