1: dibal / diethyl ether / -78 - 0 °C 2: TEA,DMAP / CH2Cl2 View Scheme

diisobutylaluminium hydride in diethyl ether T=-78 - 0°C; Yield given;

1: dibal / diethyl ether / -78 - 0 °C 2: TEA,DMAP / CH2Cl2 3: 32 percent / I2 / acetonitrile / 21 h / 0 °C 4: 13 percent / 1.) AgBF4, 2.) H2O / 26.5 h / 60 °C View Scheme