1: 85 percent / Ti(O-iPr)4, (+)-L-diethyl tartrate, cumene hydroperoxide, 4 Angstroem MS / CH2Cl2 / 144 h / -25 °C 2: 82 percent / CuCN / diethyl ether / 1.) -78 deg C, 2 h, 2.) 0 deg C, 3 h 3: 53 percent / CF3CO3H, CF3CO2H / CHCl3 / 3 h / Ambient temperature View Scheme