Br2Cu(1-)*Li(1+) 1.) THF, -50 deg C, 30 min, 2.) THF, -70 deg C, 30 min; Yield given. Multistep reaction. Yields of byproduct given. Title compound not separated from byproducts;

in diethyl ether T=-70°C; 0.5 h; Yield given;