n-butyllithium 1.) THF, hexane, -78 deg C, 15 min, 2.) THF, hexane, RT, 4 h; Yield given. Multistep reaction;

1: 98 percent / N-bromosuccinimide / tetrahydrofuran / 4 h / -78 °C 2: 1.) tert-BuLi / 1.) THF, n-pentane, -78 deg C, 15 min, 2.) THF, n-pentane, RT, 2 h 3: tetrabutylammonium fluoride / tetrahydrofuran / 1 h / Ambient temperature View Scheme