1: 4-methyl-aniline-hydrochloride With hydrogenchloride; sodium nitrite T=0°C; Diazotization; 2: azulene With sodium acetate in ethanol T=20°C; Condensation; 0.166667 h;

1: 5-[(4-methylphenyl)diazenyl]-4-phenyl-1,3-thiazol-2-amine With phosphoric acid; nitric acid; sodium nitrite in water T=0°C; 2: azulene With potassium acetate in methanol; water T=0°C;

1.1: H3PO4; HNO3; NaNO2 / H2O / 0 °C 1.2: AcOK / methanol; H2O / 0 °C 2.1: H3PO4; HNO3; NaNO2 / H2O / 0 °C 2.2: AcOK / methanol; H2O / 0 °C View Scheme