titanium tetrachloride in dichloromethane 1.) 0 - 5 deg C, 30 min, 2.) room temperature, 3 h;

N,N,N',N',N'',N''-hexamethylphosphoric triamide; lithium diisopropyl amide 1.) hexane, THF, -65 deg C, 10 min, 2.) hexane, THF, 30 min; Yield given. Multistep reaction;