1: 1.) 1,10-phenanthroline, sec-BuLi, TMEDA / 1.) THF, cyclohexane, -78 deg C, 2 h, 2.) THF, cyclohexane, RT, overnight 2: 1.) 1,10-phenanthroline, TMEDA, sec-BuLi / 1.) THF, cyclohexane, -78 deg C, 2.25 h, 2.) THF, cyclohexane, from -78 deg C to RT, overnight View Scheme

N,N,N',N,-tetramethylethylenediamine; sec.-butyllithium 1.) THF, cyclohexane, -78 deg C, 2.5 h; 2.) RT; Yield given. Multistep reaction;

1: 96 percent / BF3*OEt2 / 1.66 h / 0 °C 2: 1.) 1,10-phenanthroline, sec-BuLi, TMEDA / 1.) THF, cyclohexane, -78 deg C, 2 h, 2.) THF, cyclohexane, RT, overnight 3: 1.) 1,10-phenanthroline, TMEDA, sec-BuLi / 1.) THF, cyclohexane, -78 deg C, 2.25 h, 2.) THF, cyclohexane, from -78 deg C to RT, overnight View Scheme