1: 81 percent / sodium tetrahydridoborate; Amberlite IR-120[H+] / methanol 2: 78 percent / Amberlite IR-120 [H+] / H2O; acetonitrile / 24 h / 40 °C 3: 33 percent / immobilised glucose isomerase; MgSO4 / H2O / 65 °C / Enzymatic reaction 4: H2 / Pd/C / methanol / 20 °C View Scheme