1: With boron trifluoride diethyl etherate in chloroform T=20°C; 3.5 h; 2: With triethylamine; 2,3-dicyano-5,6-dichloro-p-benzoquinone in chloroform T=20°C; 3 h;

boron trifluoride diethyl etherate; 2,3-dicyano-5,6-dichloro-p-benzoquinone 1.) CHCl3; Yield given. Multistep reaction. Further byproducts given. Yields of byproduct given;