toluene

2: 1.) lithium diisopropylamide, 2.) O2 / 1.) THF, hexane, -78 deg C, 45 min, 2.) a) -78 deg C -> room temperature, b) 2 h View Scheme

2: 1.) lithium diisopropylamide, 2.) O2 / 1.) THF, hexane, -78 deg C, 45 min, 2.) a) -78 deg C -> room temperature, b) 2 h View Scheme

oxygen; lithium diisopropyl amide 1.) THF, hexane, -78 deg C, 45 min, 2.) a) -78 deg C -> room temperature, b) 2 h; Yield given. Multistep reaction. Yields of byproduct given;