Para Anisidine

Para-Anisidine (4-Methoxyaniline) is an aromatic amine with the molecular formula C₇H₉NO and CAS No. 104-94-9. It appears as a light reddish-brown crystalline solid and is sparingly soluble in water but readily soluble in ethanol, ether, and benzene. p-Anisidine is a key intermediate in the synthesis of azo dyes, pigments, and pharmaceuticals, valued for its reactivity and ability to form Schiff bases with aldehydes and ketones. This property is utilized in the Anisidine Value (AV) test, a standard method for detecting oxidation products in fats and oils, especially unsaturated aldehydes. Commercially, it is produced by reducing 4-nitroanisole and is available in technical and high-purity grades. It has a boiling point of 243 °C and a melting point of 56–59 °C. p-Anisidine must be handled with care due to its classification as a potential carcinogen and aquatic hazard, with strict adherence to safety and environmental regulations.