titanium tetrachloride 1) THF, HMPA, -78 deg C; 2) HMPA; 3) THF, 0 deg C; 4) CH2Cl2, 20 deg C, 30 min; Yield given. Multistep reaction;

lithium aluminium tetrahydride; titanium tetrachloride 1) THF, -78 deg C, HMPA; 2) THF; 3) CH2Cl2; Yield given. Multistep reaction. Yields of byproduct given;