1: tetrahydrofuran / 3 h / Heating 2: NaOH / methanol; tetrahydrofuran; H2O View Scheme

1: 4-(2-naphthyl)-1-butyne With lithium hexamethyldisilazane in tetrahydrofuran T=-78°C; 2: With tBuOOLi in tetrahydrofuran; toluene T=-78 - 0°C; 2.5 h; 3: tri-isopropylsylil trifluoromethane sulfonate in tetrahydrofuran; toluene T=0°C; 0.5 h;