1: 4-amino-phenol With hydrogenchloride; sodium nitrite in water 0.333333 h; Inert atmosphere; 2: o-methoxycarbonylbenzenediazonium chloride With titanium(III) chloride in water T=20°C; 0.25 h; Inert atmosphere;

1: NH4OAc / H2O 2: H2O, NaH2PO4, NaHPO4 / methanol; dioxane / 25 °C View Scheme

1: 1,4-diamino-benzene With hydrogenchloride; sodium nitrite in water 0.333333 h; Inert atmosphere; 2: o-methoxycarbonylbenzenediazonium chloride With titanium(III) chloride in water T=20°C; 0.25 h; Inert atmosphere;

sodium acetate in ethanol; water 3 h; Yield given;