2,3-dicyano-5,6-dichloro-p-benzoquinone in 1,4-dioxane Heating;

Multi-step reaction with 2 steps 1: 6percent aq. NH4OH / methanol / 2 h / Heating2: p-toluenesulfonic acid (pTSA) / dioxane; benzene / 48 h / Heating; azeotropic removal of water  

Multi-step reaction with 3 steps 1: 51 percent / p-toluenesulfonic acid (pTSA), trimethyl orthoformate / 24 h / Heating2: 6percent aq. NH4OH / methanol / 2 h / Heating3: p-toluenesulfonic acid (pTSA) / dioxane; benzene / 48 h / Heating; azeotropic removal of water  

Multi-step reaction with 4 steps 1: 88 percent / concd HCl / acetic acid / 3 h / Heating2: 51 percent / p-toluenesulfonic acid (pTSA), trimethyl orthoformate / 24 h / Heating3: 6percent aq. NH4OH / methanol / 2 h / Heating4: p-toluenesulfonic acid (pTSA) / dioxane; benzene / 48 h / Heating; azeotropic removal of water