1.1: H2O2; (CF3)2CHOH / 3 h / 23 °C 1.2: 92 percent / toluene / 1 h / 80 °C 2.1: 87 percent / Grubb's catalyst / toluene / 0.17 h / 120 °C 3.1: 68 percent / SOCl2 / diethyl ether / 0 °C 4.1: 74 percent / aq. HCl / dioxane / 3 h / 23 °C 5.1: 86 percent / K2CO3 / dimethylformamide / 1 h / 23 °C View Scheme