1: 58.7 percent / 5N NaOH / methanol / 2.25 h / Heating 2: 68 percent / 6N HCl / 16 h / Heating 3: thionyl chloride / CH2Cl2 / 4 h / Heating 4: anh. AlCl3 / CH2Cl2 / 2 h / Heating 5: 55.4 percent / LiAlH4 / tetrahydrofuran / 192 h / Heating 6: 85 percent / 10percent H2SO4 / 24 h / Heating View Scheme