1: 82 percent / 10 N NaOH, NaBH4 / ethanol / 1) 20 deg C, 12 h, 2) reflux, 2h 2: ethanol / 0.67 h / Heating 3: ion exchanger (Lewatit MP 600) / H2O; methanol 4: 20 percent / 450 °C View Scheme

in various solvent(s) T=180 - 200°C;