1: 86 percent / chromous chloride; LiI / tetrahydrofuran 2: 87 percent / Ph3P; NaOH / Pd2((dba)2*CHCl3 / tetrahydrofuran; H2O / Heating 3: 99 percent / DIBAL-H / tetrahydrofuran / -78 °C 4: 94 percent / i-Pr2NEt; 4-DMAP / CH2Cl2 5: 98 percent / n-Bu4NF / tetrahydrofuran 6: 91 percent / CH2Cl2 / -78 °C 7: 99 percent / benzene / Heating 8: 94 percent / DIBAL-H / tetrahydrofuran / -78 °C 9: 93 percent / CH2Cl2 / -78 °C 10: 75 percent / Me3Al / CH2Cl2 / 4 h / 0 °C 11: NaBH4 / ethanol / 0 °C 12: 92 percent / imidazole; 4-DMAP / CH2Cl2 13: 62 percent / bromotrimethylsilane / CH2Cl2 14: 95 percent / CH2Cl2 15: 93 percent / chromous chloride / tetrahydrofuran / 20 °C 16: 99 percent / n-Bu4NF / dimethylformamide 17: 99 percent / CH2Cl2 18: 92 percent / Zn / benzene / Heating 19: 83 percent / Dess-Martin periodinane / CH2Cl2 20: 96 percent / toluene / Heating 21: 99 percent / HF / acetonitrile 22: NaH / CH2Cl2 View Scheme