2,3-dicyano-5,6-dichloro-p-benzoquinone; trichlorophosphate in N,N-dimethyl-formamide T=20°C; 2 h;

1.1: lithium diisopropylamide / tetrahydrofuran / 1.5 h / -78 - 20 °C 1.2: 61 percent / tetrahydrofuran / 1.5 h / -78 - 20 °C 2.1: 50 percent / HNO3; H2SO4 / H2O / 0.08 h / 0 °C 3.1: 75 percent / 2,3-dichloro-5,6-dicyano-1,4-benzoquinone; phosphorus oxychloride / dimethylformamide / 2 h / 20 °C View Scheme

1: 50 percent / HNO3; H2SO4 / H2O / 0.08 h / 0 °C 2: 75 percent / 2,3-dichloro-5,6-dicyano-1,4-benzoquinone; phosphorus oxychloride / dimethylformamide / 2 h / 20 °C View Scheme