lithium diisopropyl amide in tetrahydrofuran T=-70°C; 0.5 h; Yield given. Yields of byproduct given;

1: LDA / tetrahydrofuran / 1.) -70, 1 h 2.) room temp., 2 h 2: TiCl4 / CH2Cl2 / 1.) 20 deg C, 5 min, 2.) -45 deg C, 5 min View Scheme