tert.-butyl lithium 1.) THF, -5 degC, 45 min; 2.) THF, -78 degC, 0.5 h; Yield given. Multistep reaction;

n-butyllithium; N,N,N',N,-tetramethylethylenediamine 1.) THF, -5 degC, 45 min; 2.) THF, -78 degC, 15 min; Multistep reaction. Yields of byproduct given;