n-butyllithium; copper(I) bromide dimethylsulfide complex 1.) THF, hexane, -78 deg C, 30 min; -78 to -60 deg C, 1 h, 2.) THF, -78 deg C, 1 h; Yield given. Multistep reaction;

n-butyllithium; copper(I) bromide dimethylsulfide complex 1.) THF, hexane, -78 deg C, 30 min; -78 to -60 deg C, 1 h, 2.) THF, -78 deg C, 4 h; Yield given. Multistep reaction;