1: 62 percent / NaH, tris<2-(2-methoxyethoxy)ethyl>amine / CH2Cl2 / 24 h / Ambient temperature 2: 78 percent / NaH2PO2*H2O / Pd/C (10percent) / H2O; dioxane / 8 h / Heating 3: 58 percent / aq. NaOH / methanol / 24 h / Ambient temperature View Scheme

1: 78 percent / NaH2PO2*H2O / Pd/C (10percent) / H2O; dioxane / 8 h / Heating 2: 58 percent / aq. NaOH / methanol / 24 h / Ambient temperature View Scheme

1: 83 percent / sodium hydride / dimethylsulfoxide / 20 °C 2: 80 percent / aq. NaOH / ethanol / Heating View Scheme

1: water; NaOH-solution 2: dioxane; ammonium polysulfide / 170 °C 3: aqueous KOH View Scheme

1: dioxane; ammonium polysulfide / 170 °C 2: aqueous KOH View Scheme