1: H2 / 10percent Pd/C / ethanol 2: 0.5 N aq. barium hydroxide / Heating; overnight 3: Et3N / butan-1-ol / 48 h / Heating 4: 1.) 3 N HCl, sodium nitrite, 2.) sodium acetate trihydrate / 1.) water, 2.) acetic acid, water, RT, overnight 5: 69 percent / Zn, acetic acid / H2O; ethanol / 3 h / Heating 6: 82 percent / sodium nitrite, acetic acid / H2O / 1 h / 0 °C 7: 81 percent / 0.25 N aq. NaOH / 3 h / Heating View Scheme

sodium hydroxide 3 h; Heating;