1: 2-methyl-but-3-yn-2-ol With n-butyllithium in tetrahydrofuran; hexane T=-30°C; 1 h; 2: cyclohexanone in tetrahydrofuran; hexane T=-30 - 20°C;

in tetrahydrofuran T=20 - 23°C;

n-butyllithium 1.) THF, hexane, -78 deg C, 2 h, 2.) THF, hexane, -65 deg C, 6 h; Yield given. Multistep reaction;