1.1: 89 percent / DIBAL-H / diethyl ether / 0.5 h / -70 °C 2.1: 83 percent / K2CO3 / methanol / 3 h / 20 °C 3.1: n-butyllithium / tetrahydrofuran / 1.25 h / -78 °C 3.2: 95 percent / tetrahydrofuran / -78 - 20 °C View Scheme