N,N,N',N,-tetramethylethylenediamine; tert.-butyl lithium 1. ether, pentane, -78 deg C; 2. heptane, r.t., 24 h; Yield given. Multistep reaction. Yields of byproduct given;

N,N,N',N,-tetramethylethylenediamine; tert.-butyl lithium 1. ether, pentane, -78 deg C; 2. heptane, r.t., 24 h; Yield given. Multistep reaction. Yields of byproduct given;