1: 78 percent / tetrahydrofuran / 0 °C 2: 88 percent / TEA, DMAP / tetrahydrofuran; dimethylformamide 3: 86 percent / dibal / toluene / -78 - 0 °C 4: 86 percent / CHCl3 / Heating 5: 85 percent / dibal / toluene / -78 - 0 °C 6: 1.) KH / 1.) THF, DMF View Scheme

1: 86 percent / dibal / toluene / -78 - 0 °C 2: 86 percent / CHCl3 / Heating 3: 85 percent / dibal / toluene / -78 - 0 °C 4: 1.) KH / 1.) THF, DMF View Scheme

1: 86 percent / CHCl3 / Heating 2: 85 percent / dibal / toluene / -78 - 0 °C 3: 1.) KH / 1.) THF, DMF View Scheme

potassium hydride 1.) THF, DMF; Yield given. Multistep reaction;

1: 48percent aq. HF / acetonitrile / 0 °C 2: 80 percent / I2, Na2CO3 / acetonitrile / 3 h / 0 °C View Scheme

hydrogen fluoride in acetonitrile T=0°C; Yield given;