hydrogenchloride T=115°C; 6 h;

2,3-dicyano-5,6-dichloro-p-benzoquinone 1.) Et2O, 0 deg C, 1h, 2.) THF, H2O, Et2O, 0 deg C, 2 h ; 23 deg C, 1 h; Yield given. Multistep reaction;