1: deca-1,9-diyne With n-butyllithium in tetrahydrofuran; hexane T=-70°C; 1.5 h; 2: methyl iodide in tetrahydrofuran; hexane T=-70 - 20°C;

hexacarbonyl molybdenum; 4-(trifluoromethyl)phenol in toluene T=110°C;