1: 90 percent / pyridine / 24 h / Ambient temperature 2: 55 percent / SnCl4 / benzene / 0.5 h / 0 °C / 1.) 0 deg C, 30 min, 2.) RT, 1.5 h 3: 95 percent / 10percent ethanolic KOH / 6 h / Heating 4: 66 percent / 100percent hydrazine hydrate / bis-(2-hydroxy-ethyl) ether / 30 h / 120 °C 5: 0.25 percent / Raney nickel W-2 / ethanol / 2 h / Heating View Scheme

1: 90 percent / pyridine / 24 h / Ambient temperature 2: 55 percent / SnCl4 / benzene / 0.5 h / 0 °C / 1.) 0 deg C, 30 min, 2.) RT, 1.5 h 3: 95 percent / 10percent ethanolic KOH / 6 h / Heating 4: 66 percent / 100percent hydrazine hydrate / bis-(2-hydroxy-ethyl) ether / 30 h / 120 °C 5: 12.6 percent / Raney nickel W-2 / ethanol / 2 h / Heating View Scheme

1: 90 percent / pyridine / 24 h / Ambient temperature 2: 55 percent / SnCl4 / benzene / 0.5 h / 0 °C / 1.) 0 deg C, 30 min, 2.) RT, 1.5 h 3: 95 percent / 10percent ethanolic KOH / 6 h / Heating 4: 66 percent / 100percent hydrazine hydrate / bis-(2-hydroxy-ethyl) ether / 30 h / 120 °C 5: 0.4 percent / Raney nickel W-2 / ethanol / 2 h / Heating View Scheme

1: 90 percent / pyridine / 24 h / Ambient temperature 2: 55 percent / SnCl4 / benzene / 0.5 h / 0 °C / 1.) 0 deg C, 30 min, 2.) RT, 1.5 h 3: 95 percent / 10percent ethanolic KOH / 6 h / Heating 4: 66 percent / 100percent hydrazine hydrate / bis-(2-hydroxy-ethyl) ether / 30 h / 120 °C 5: 2.8 percent / Raney nickel W-2 / ethanol / 2 h / Heating View Scheme

1: 90 percent / pyridine / 24 h / Ambient temperature 2: 55 percent / SnCl4 / benzene / 0.5 h / 0 °C / 1.) 0 deg C, 30 min, 2.) RT, 1.5 h 3: 95 percent / 10percent ethanolic KOH / 6 h / Heating 4: 66 percent / 100percent hydrazine hydrate / bis-(2-hydroxy-ethyl) ether / 30 h / 120 °C 5: 6 percent / Raney nickel W-2 / ethanol / 2 h / Heating View Scheme