1: 94 percent / tetrahydrofuran; diethyl ether / 0.5 h / 0 °C 2: 61 percent / 25percent H2SO4 / butan-1-ol / 7.5 h / Heating View Scheme

1: 94 percent / tetrahydrofuran; diethyl ether / 0.5 h / 0 °C 2: 61 percent / 25percent H2SO4 / butan-1-ol / 7.5 h / Heating 3: 91 percent / AcOH / H2O / 2 h / Ambient temperature View Scheme

With  acetic anhydride in  n-heptane 1 h;  Heating;   

Multi-step reaction with 2 steps 1: 1.) n-BuLi / 1.) THF, hexane, 0 deg C, 2.) THF, hexane, 0 deg C, 30 min2: 88 percent / Ac2O / heptane / 1 h / Heating