1: hepta-1,6-diyn-3-ol With 4-(N,N-dimethlyamino)pyridine; dicyclohexyl-carbodiimide in dichloromethane T=20°C; 12 h; 2: acetylene With (pentamethylcyclopentadienyl)Ru(1,5-cyclooctadiene)Cl in 1,2-dichloro-ethane T=20°C; 24 h; 3: With potassium carbonate in tetrahydrofuran; methanol T=20°C; 16 h; Further stages.;