1: 1) n-BuLi, t-BuOK / 1) hexane, a) -60 to -20 deg C, b) -20 deg C, 1 h, c) -10 deg C, 3 h, 2) r.t., overnight 2: 1) n-BuLi, TMEDA / 1) hexane, 12 h, r.t., 2) 24 h View Scheme

n-butyllithium; N,N,N',N,-tetramethylethylenediamine 1) hexane, 12 h, r.t., 2) 24 h; Yield given. Multistep reaction;

Yield given. Multistep reaction;