1: 87 percent / methanol / 20 h / Heating 2: 1.) t-Butyl lithium / 1.) THF, pentane, -70 deg C, 15 min, 2.) -70 deg C, 2 h 3: 85 percent / CHCl3 / 2 h / Heating 4: 85 percent / aq. NaOH / methanol / 3 h View Scheme

1: 87 percent / methanol / 20 h / Heating 2: 97 percent / CHCl3 / 2 h / Heating View Scheme

1: 87 percent / methanol / 20 h / Heating 2: 1.) t-Butyl lithium / 1.) THF, pentane, -70 deg C, 15 min, 2.) -70 deg C, 2 h View Scheme