1: 91 percent / KHF2, KF / 5 h / 70 °C 2: 86 percent / heptane; pentane / 6 h 3: 90 percent / Br2 / pentane / 0 °C 4: 58 percent / Na / heptane / 3 h / Heating 5: heptane / 12 h / 100 °C / dependence of product distribution on time, temperature, solvents or in absence of tri-terc-butyl silyl-halogenide View Scheme
