in dichloromethane T=-40°C; 2 h; Yield given. Yields of byproduct given. Title compound not separated from byproducts;

in diethyl ether T=-45°C; 2 h; Yield given. Yields of byproduct given. Title compound not separated from byproducts;

copper(l) iodide 1.) Et2O, hexane, -40 deg C, 30 min, 2.) -78 deg C, 10 min; Yield given. Multistep reaction. Yields of byproduct given. Title compound not separated from byproducts;

in diethyl ether; water Yield given. Yields of byproduct given;