1: Octa-1,7-diyne With n-butyllithium in tetrahydrofuran; hexane T=-78°C; 0.5 h; 2: 2-(1,3-dioxolan-2-yl)ethyl iodide With N,N,N',N',N'',N''-hexamethylphosphoric triamide in tetrahydrofuran; hexane T=-78 - 20°C; 16 h;

n-butyllithium 1) THF, -78 deg C, 4 h; 2) HMPA, -78 deg C--> room temp., then room temp., 12 h; Multistep reaction;