in ethanol 8.5 h; Heating;

n-butyllithium 1.) hexane, THF, -78 deg C, 1 h; 2.) THF, -78 deg C.; Yield given. Multistep reaction;

1: 1.) n-BuLi / 1.) THF, hexane, from -20 deg C to RT, 20 min, 2.) THF, hexane, from -78 deg C to RT 2: 1.) n-BuLi / 1.) THF, hexane, 2.) THF, hexane, from -78 deg C to RT 3: CuCl2/SiO2 / CH2Cl2 / 48 h / Ambient temperature View Scheme