2,3-dicyano-5,6-dichloro-p-benzoquinone in benzene Ambient temperature;

With  toluene-4-sulfonic acid in  benzene 16 h;  Ambient temperature;  Yield given;   

Multi-step reaction with 2 steps 1: NaBH4 / tetrahydrofuran; methanol / 1 h / 0 °C2: p-TsOH / benzene / 16 h / Ambient temperature  

Multi-step reaction with 3 steps 1: 85 percent / 2.5 h / 55 °C2: NaBH4 / tetrahydrofuran; methanol / 1 h / 0 °C3: p-TsOH / benzene / 16 h / Ambient temperature  

Multi-step reaction with 4 steps 1: 59 percent / KOH, H2O / 3.5 h / Heating2: 85 percent / 2.5 h / 55 °C3: NaBH4 / tetrahydrofuran; methanol / 1 h / 0 °C4: p-TsOH / benzene / 16 h / Ambient temperature