boron trifluoride diethyl etherate; 2,3-dicyano-5,6-dichloro-p-benzoquinone 1.) reflux, 4.5 h; 2.) benzene, reflux, 3 h; Yield given. Multistep reaction. Yields of byproduct given. Title compound not separated from byproducts;

boron trifluoride diethyl etherate 4.5 h; Heating; Yield given. Yields of byproduct given. Title compound not separated from byproducts;

boron trifluoride diethyl etherate; 2,3-dicyano-5,6-dichloro-p-benzoquinone 1.) reflux, 4.5 h; 2.) benzene, reflux, 3 h; Yield given. Multistep reaction. Yields of byproduct given. Title compound not separated from byproducts;