water; titanium tetrachloride 1.) CH2Cl2, -78 deg C, 0.5 h, 2.) -78 deg C; Yield given. Multistep reaction. Yields of byproduct given. Title compound not separated from byproducts;

water; titanium tetrachloride 1.) CH2Cl2, -78 deg C, 30 min, 2.) -78 deg C; Yield given. Multistep reaction. Yields of byproduct given;