1: 1.) n-BuLi, tetramethylethylenediamine (TMEDA) / 1.) ether, THF, 0 deg C, 30 min, 2.) ether, THF, RT, 24 h 2: 84 percent / 3 N aq. HCl / 7 h / Heating 3: 79 percent / tetrahydrofuran / 4 h / Heating 4: 93 percent / AlCl3 / CH2Cl2 / 1 h / Ambient temperature 5: 92 percent / KOH / ethanol / 1 h / Heating 6: 66 percent / polyphosphoric acid / 2 h / 110 °C View Scheme

N,N,N',N,-tetramethylethylenediamine; sec.-butyllithium 1.) THF, -78 deg C, 2.) -78 deg C; Yield given. Multistep reaction;