n-butyllithium; N,N,N',N,-tetramethylethylenediamine; copper dichloride 1.) Et2O, cyclohexane, RT, 16 h, 2.) Et2O, cyclohexane, 5 deg C, 3 h; Yield given. Multistep reaction;

n-butyllithium; lithium 1.) Et2O, hexane, 30 min, 2.) Et2O, hexane, 0 deg C, 3 h; Yield given. Multistep reaction;