1: KOtBu / 2-methyl-propan-2-ol / 3 h / Heating 2: H2 / Pd-Al2O3 / propan-2-ol / 102 - 110 °C / 41371.8 - 51714.8 Torr View Scheme

potassium tert-butylate; acetylene in tert-butyl alcohol T=120°C; 1.25 h;