1: 83 percent / pyridine / CH2Cl2 / 6 h / Ambient temperature 2: 28percent NaOH, H2O / 2 h / 10 °C 3: 83.4 percent / 18 h 4: Na-amalgam (5percent), methanol / 1 h / Ambient temperature View Scheme

1: pyridine / CH2Cl2 / 6 h / Ambient temperature 2: 28percent NaOH, H2O / 2 h / 10 °C View Scheme

1: 51 percent / pyridine / toluene 2: 80 percent / NaOCH2CH2OH / ethane-1,2-diol View Scheme