1: 77 percent / perchloric acid / ethyl acetate; H2O / 2 h / Ambient temperature 2: 70 percent / sodium methoxide / methanol / 7.5 h / Ambient temperature 3: 40 percent / sodium methoxide / benzene / 3 h / Heating 4: pyridine / 9 h / Ambient temperature 5: trimethylammonium acetate / tetrakis(triphenylphosphine)palladium(0) / tetrahydrofuran / 3.5 h / Heating View Scheme

1: 77 percent / perchloric acid / ethyl acetate; H2O / 2 h / Ambient temperature 2: 70 percent / sodium methoxide / methanol / 7.5 h / Ambient temperature 3: 40 percent / sodium methoxide / benzene / 3 h / Heating 4: pyridine / 9 h / Ambient temperature 5: trimethylammonium acetate / tetrakis(triphenylphosphine)palladium(0) / tetrahydrofuran / 3.5 h / Heating View Scheme

1: 77 percent / perchloric acid / ethyl acetate; H2O / 2 h / Ambient temperature 2: 70 percent / sodium methoxide / methanol / 7.5 h / Ambient temperature 3: 40 percent / sodium methoxide / benzene / 3 h / Heating 4: pyridine / 9 h / Ambient temperature 5: trimethylammonium acetate / tetrakis(triphenylphosphine)palladium(0) / tetrahydrofuran / 3.5 h / Heating View Scheme