1: powdered sodium hydroxide / dioxane / 14 h / Ambient temperature; further solvents were also used 2: Adogen, sodium dithionite, NaHCO3 / cyclohexane; H2O / 2 h / Heating View Scheme

1: powdered sodium hydroxide / dioxane / 14 h / Ambient temperature; further solvents were also used 2: Adogen, sodium dithionite, NaHCO3 / cyclohexane; H2O / 2 h / Heating 3: pyridine / 4 h / Ambient temperature View Scheme