n-butyllithium 1.) THF, hexane, 15 min; 2.) THF, hexane, 65 deg C, 28 h; Yield given. Multistep reaction;

1: C4H9Li / tetrahydrofuran; hexane 2: 47 percent / petroleum ether; tetrahydrofuran; hexane / 1.) -30 degC, 2.) heating to room temp. in 5h 3: 61 percent / tert-C4H9Li / tetrahydrofuran; pentane / 2 h / Heating; also with (iso-C3H7)2NLi in THF/hexane View Scheme