1: n-dodecyl iodide With tert.-butyl lithium in diethyl ether; pentane T=20°C; 1.5 h; 2: 1,10-phenanthroline in diethyl ether; pentane T=20°C; 17 h; 3: With manganese(IV) oxide in dichloromethane T=20°C; 2 h;

lithium diisopropyl amide in tetrahydrofuran; cyclohexane a) -78 deg C, 5 h, b) to r.t., overnight;