copper(l) iodide; potassium carbonate in dimethyl sulfoxide T=30°C; 72 h;

1: S-phenyl-N,N-diethyl-sulfenamide With tin(IV) chloride in tetrachloromethane T=0°C; 0.5 h; 2: hex-3-yne in tetrachloromethane T=20°C; 5 h; Title compound not separated from byproducts;

1: S-phenyl-N,N-diethyl-sulfenamide With tin(IV) chloride in tetrachloromethane T=0°C; 0.5 h; 2: hex-3-yne in tetrachloromethane T=20°C; 5 h; 3: With potassium tert-butylate in tert-butyl alcohol 1 h; Heating; Title compound not separated from byproducts;

n-butyllithium 1) THF, hexane, -70 deg C, 0.5 h, 2) -70 deg C, 0.5 h, 3) room temp.; Multistep reaction;

sodium hydroxide; N,N,N',N,-tetramethylethylenediamine; bis(cyclohexanyl)borane; dihydrogen peroxide Multistep reaction;

silica gel; toluene-4-sulfonic acid in dichloromethane T=40°C; 49 h;

sodium hydroxide; N,N,N',N,-tetramethylethylenediamine; bis(cyclohexanyl)borane; dihydrogen peroxide Multistep reaction;