sodium hydride in tetrahydrofuran; N,N-dimethyl-formamide T=20°C; 2 h;

1: 1-ethynyl-cyclohexan-1-ol With sodium hydride in N,N-dimethyl-formamide T=0°C; 2 h; Inert atmosphere; 2: allyl halide in N,N-dimethyl-formamide T=0 - 20°C; Inert atmosphere;

potassium hydroxide 1.) DMSO, 15-17 degC, 1 h; 2.) DMSO, 45 degC, 4 h; Yield given. Multistep reaction;