1: 59 percent / aq. NaOH / tetrahydrofuran / 4 h / 20 °C 2: 96 percent / K2CO3 / acetone / 48 h / 20 °C 3: 73 percent / NaI; HCl / acetone; methanol / 4 h View Scheme

sodium hydroxide in tetrahydrofuran T=20°C; 4 h;