1: dioxane dibromide / diethyl ether 2: 1) n-butyllithium / 1) a) diethyl ether, 0 deg C, b) room temperature, 1.5 h, 2) a) 0 deg C, b) room temperature, 1.5 h View Scheme

n-butyllithium 1) a) diethyl ether, 0 deg C, b) room temperature, 1.5 h, 2) a) 0 deg C, b) room temperature, 1.5 h; Multistep reaction;

3-chloro-benzenecarboperoxoic acid in dichloromethane 1) 0 deg C, 2) room temperature, 16 h;