water in Gegenwart eines sauren Kationenaustauschers;

1: 95 percent / 1,2-dichloro-ethane / Ambient temperature 2: 85 percent / 4percent aq H2SO4 / tetrahydrofuran / Heating 3: tetrahydrofuran / Ambient temperature 4: imidazole / dimethylformamide / 60 °C 5: 43 percent / n-Bu3SnH, AIBN / toluene / Heating 6: 88 percent / DIBAL-H / CH2Cl2 / -78 °C 7: 90 percent / t-BuOK / tetrahydrofuran / -78 °C 8: 94 percent / (COCl)2, DMSO, Et3N 9: 93 percent / NaN<Si(CH3)3>2 / tetrahydrofuran / Ambient temperature 10: 83 percent / (S)-BINAL-H View Scheme