N-ethyl-N,N-diisopropylamine in dichloromethane 12 h; Ambient temperature;

3-chloro-benzenecarboperoxoic acid in dichloromethane Heatingovernight;

1: 79 percent / meta-chloroperbenzoic acid / CH2Cl2 / Heating; overnight 2: lithium diisopropylamide / 1.) THF, ether, 1 h, 0 deg C 2.) -65 deg C, room temp. overnight, reflux in benzene, silica 3: m-chloroperbenzoic acid 4: benzene / Heating View Scheme