1: 77 percent / Mg / tetrahydrofuran; diethyl ether / 16 h / Heating 2: KH / hexamethylphosphoric acid triamide / 1.) room temp., 1 h; 2.) 40 deg C, 1 h View Scheme

1: 85 percent / lithium aluminium hydride / tetrahydrofuran / 0.5 h 2: 57 percent / pyridinium chlorochromate / CH2Cl2 / 1.5 h / other reagent 3: 1.) n-butyl-lithium, TMEDA 2.) n-butyl-lithium / 1.) hexane, THF, 0 deg C, 15 min 2.) 30 min, hexane, THF 4: 23 percent / toluene-p-sulphonic acid / benzene / 0.02 h View Scheme

1: 72 percent / iodotrimethylsilane / CCl4 / 29 h / Heating 2: 85 percent / thionyl chloride / 4 h / Heating 3: 92 percent / TiCl4 / CH2Cl2 / 2 h / -78 °C 4: NaBH4 / methanol / 13 h / Ambient temperature 5: 73 percent / NaOH / methanol; H2O / 2 h / Ambient temperature 6: 86 percent / 5 molpercent RhH(PPh3)4 / benzene / 20 h / 105 °C / sealed tube View Scheme

trimethylsilyl iodide in tetrachloromethane 29 h; Heating;