sodium azide; sulfuric acid in water; benzene T=100°C; P=11400 - 12160 Torr; 60 h;

potassium hydroxide; acetylene in 1,4-dioxane T=175 - 180°C; P=7600 - 9120 Torr; 1.5 h;

potassium hydroxide in 1,4-dioxane T=175 - 180°C; P=7600 - 9120 Torr; 1.5 h;

mercury(II) diacetate; hydroquinone; trifluoroacetic acid T=70°C; 3 h;

1: 1-azidoethanol With triethylamine 2: acetylene With copper nanoparticles on activated carbon; triethylamine in 1,4-dioxane T=30°C; 24 h; 3: With 1,8-diazabicyclo[5.4.0]undec-7-ene; sodium iodide in ethylene glycol dimethyl ether T=130°C; 1 h;