copper(I) bromide; lithium bromide 1.) THF, -50 deg C, 15 min; 2.) -70 deg C, 12 h; Yield given. Multistep reaction. Yields of byproduct given;

copper(I) bromide; lithium bromide 1.) THF, -50 deg C, 15 min; 2.) -70 deg C, 12 h; Yield given. Multistep reaction. Yields of byproduct given. Title compound not separated from byproducts;