1.1: 92 percent / CF3COOH; Et3SiH / 1,2-dichloro-ethane / 48 h / 100 °C 2.1: toluene; diethyl ether / 0.25 h / -78 °C 2.2: toluene; diethyl ether / 2 h / -78 - 0 °C 3.1: TMSOTf / CH2Cl2 / 0.75 h / 0 - 20 °C 4.1: 6.03 g / Mg; HgCl2 / ethanol; tetrahydrofuran / 2 h / 20 °C 5.1: aq. KOH / methanol / 17 h / 90 °C 5.2: 91 percent / methanol; CH2Cl2 / 0.25 h / 20 °C 6.1: 96 percent / iPr2NEt / CH2Cl2 / 4 h / 20 °C 7.1: 91 percent / CBr4; PPh3 / benzene / 0.75 h / 20 - 50 °C 8.1: 60 percent / Bu4NI / dimethylsulfoxide / 12 h / 80 °C 9.1: 80 percent / aq. NaOH; aq. H2O2 / methanol / 3 h / 20 °C 10.1: aq. KOH / methanol / 12 h / 90 °C 11.1: CF3COOH / CH2Cl2 / 1.5 h / 20 °C 11.2: 4.5 mg / Dowex-50 H(1+) View Scheme