(i) (diazotization), (ii) /BRN= 128609/, NaOAc; Multistep reaction;

in ethanol Heating;

1: I2 2: 1.) NaNO2, 3N HCl; 2.) NaOAc / 1.) water, 0 deg C; 2.) water, ethanol, 2 h View Scheme

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;