1: 82 percent / activated Fe, FeSO4*7H2O / methanol; H2O / 5 h / 70 °C 2: 48 percent / 2,6-lutidine / dimethylformamide; toluene / 24 h / 70 °C View Scheme

1: 82 percent / activated Fe, FeSO4*7H2O / methanol; H2O / 5 h / 70 °C 2: 48 percent / 2,6-lutidine / dimethylformamide; toluene / 24 h / 70 °C 3: 22 percent / 2,6-lutidine / various solvent(s) / 18 h / 80 °C 4: 41 percent / 1 N aq. NaOH / 2 h View Scheme

1: 82 percent / activated Fe, FeSO4*7H2O / methanol; H2O / 5 h / 70 °C 2: 48 percent / 2,6-lutidine / dimethylformamide; toluene / 24 h / 70 °C 3: 22 percent / 2,6-lutidine / various solvent(s) / 18 h / 80 °C View Scheme