sulfuric acid in diethyl ether T=20°C; 36 h;

1: 70 percent / HNO3; Ac2O / 12 h / -40 - 20 °C 2: 88 percent / DMAP / 10 h / 60 °C 3: 80 percent / aq. NaOH / methanol / 20 h / 60 °C 4: 83 percent / H2SO4 / diethyl ether / 36 h / 20 °C View Scheme

1: 80 percent / aq. NaOH / methanol / 20 h / 60 °C 2: 83 percent / H2SO4 / diethyl ether / 36 h / 20 °C View Scheme

1: 88 percent / DMAP / 10 h / 60 °C 2: 80 percent / aq. NaOH / methanol / 20 h / 60 °C 3: 83 percent / H2SO4 / diethyl ether / 36 h / 20 °C View Scheme