2,3-dicyano-5,6-dichloro-p-benzoquinone in methanol T=20°C; 14 h;

ammonia; water T=25°C;

1: 99 percent / zinc; sodium hydroxide / H2O / 96 h / Heating 2: dicyclohexylcarbodiimide / dimethylformamide / 8 h 3: 77 mg / ammonia / CH2Cl2; ethanol; dimethylformamide / 14 h / 20 °C 4: 75 percent / 2,3-dichloro-5,6-dicyano-1,4-benzoquinone / methanol / 14 h / 20 °C View Scheme

tin(IV) chloride T=115 - 120°C;