1: 73 percent / methanol / 3 h / Ambient temperature 2: 1) n-butyllithium / 1) THF, hexane, -78 deg C, 2) up to room temp. View Scheme

1: 1) Ph3P, Zn dust / CH2Cl2, 1) 20 deg C, 23 h, 2) 20 deg C, 22 h 2: 73 percent / methanol / 3 h / Ambient temperature 3: 1) n-butyllithium / 1) THF, hexane, -78 deg C, 2) up to room temp. View Scheme

n-butyllithium 1) THF, hexane, -78 deg C, 2) up to room temp.; Yield given. Multistep reaction;