triethylamine in dichloromethane 1 h; Heating;

dilithium tetrachlorocuprate; magnesium 1.) Et2O, 2.) Et2O/THF, -78 deg C, then room temp.; Yield given. Multistep reaction. Yields of byproduct given. Title compound not separated from byproducts;

dilithium tetrachlorocuprate; magnesium 1.) Et2O, 2.) Et2O/THF, -78 deg C, then room temp.; Yield given. Multistep reaction. Yields of byproduct given. Title compound not separated from byproducts;

Multistep reaction. Title compound not separated from byproducts;