n-butyllithium; bromine 1.) diethylether, hexane, -40 deg C, 2.) -40 deg C; Multistep reaction;

copper(l) iodide; triethylamine; bis-triphenylphosphine-palladium(II) chloride in tetrahydrofuran

n-butyllithium in tetrahydrofuran (N2); addn. of BuLi to the alkyne in THF at 0°C, stirring (2 min), cooling to -78°C, addn. of Me3SnCl, warming to 21°C, stirring (1 h); aq. workup, extn. (pentane), solvent removal;

tetrakis(triphenylphosphine) palladium(0) in tetrahydrofuran T=65°C; 4 h;

bis-triphenylphosphine-palladium(II) chloride; copper(l) iodide; triethylamine in tetrahydrofuran Inert atmosphere;