1: trimethylsilylacetylene With n-butyllithium in tetrahydrofuran T=0°C; 0.166667 h; 2: 4-(1,1-dimethylethyl)cyclohexanone in tetrahydrofuran T=20°C; 3: With hydrogenchloride in tetrahydrofuran; water T=20°C;

n-butyllithium in tetrahydrofuran 1.) -35 to 0 deg C, 2 h, 2.) 0 deg C, 0.5 h;

potassium tert-butylate in tetrahydrofuran T=20°C; 3.5 h;

1: xylene / 0.33 h / Heating 2: 85 percent / n-BuLi / tetrahydrofuran / 1.) -35 to 0 deg C, 2 h, 2.) 0 deg C, 0.5 h View Scheme

1: 1.) LDA / 1.) THF 2: xylene / 0.33 h / Heating 3: 85 percent / n-BuLi / tetrahydrofuran / 1.) -35 to 0 deg C, 2 h, 2.) 0 deg C, 0.5 h View Scheme