1: 90 percent / aq. NaOH / methanol / 1 h / Heating 2: 83 percent / dicyclohexylcarbodiimide / tetrahydrofuran / 14 h / 15 °C 3: 50 percent / lithium hexamethyldisilazide / tetrahydrofuran / 96 h / Heating View Scheme

sodium hydroxide in methanol 1 h; Heating;

sodium bis(2-methoxyethoxy)aluminium dihydride in tetrahydrofuran Heating;