1: 85 percent / Et3SiH, BF3-Et2O / CH2Cl2 / 1 h / 0 °C 2: 95 percent / aq. NaOH / methanol / 1 h / Heating 3: 100 percent / SOCl2 / 3 h / 80 °C 4: 89 percent / AlCl3 / benzene / 1.5 h / Heating View Scheme

1: 85 percent / Et3SiH, BF3-Et2O / CH2Cl2 / 1 h / 0 °C 2: 95 percent / aq. NaOH / methanol / 1 h / Heating View Scheme