1.1: 94 percent / triphenylphosphine; iodine; imidazole / 3 h / 70 °C 2.1: DIBAL-H / CH2Cl2 / 1 h / -78 °C 2.2: 96 percent / CH2Cl2 / 24 h / 20 °C 3.1: 84 percent / W2 Raney nickel; H2 / 24 h / 20 °C 4.1: 92 percent / Et3N / CH2Cl2 / 4 h / 0 °C 5.1: 72 percent / Na2S; S / dimethylformamide / 24 h / 90 °C 6.1: 75 percent / KOH / ethanol / 24 h / 20 °C View Scheme