p-Anisidine, known scientifically as 4-methoxyaniline and identified by CAS number 104-94-9, is an aromatic amine characterized by a methoxy group (-OCH3) attached to the para position of an aniline ring. Its molecular formula is C7H9NO, with a molecular weight of approximately 123.15 g/mol. Understanding its chemical properties is fundamental for its effective use in various industrial applications, particularly in dye and pharmaceutical synthesis. One of the most distinguishing chemical properties of p-Anisidine is its basicity due to the presence of the amino group (-NH2). This group readily undergoes reactions such as acylation, alkylation, and diazotization. The diazotization reaction, in particular, is critical for its use in the dye industry, where it forms diazonium salts that are subsequently coupled with other aromatic compounds to create azo dyes. These reactions require careful control of temperature and pH to ensure optimal yield and purity of the desired products. The physical appearance of p-Anisidine is typically described as a light brown solid or crystal, with a melting point range of 56-59°C. This solid form simplifies handling and storage compared to liquid chemicals. Its solubility in water is limited, but it is soluble in common organic solvents such as ethanol, ether, and acetone, which is beneficial for its use in various reaction media. The synthesis of p-Anisidine commonly involves the reduction of 4-nitroanisole. This process can be achieved through various methods, including catalytic hydrogenation using catalysts like palladium or platinum, or chemical reduction using agents such as iron in acidic medium or sodium hydrosulfite. The choice of synthesis route often depends on factors like desired purity, scale of production, and economic considerations. Manufacturers strive for high purity levels, typically above 99%, to meet the demanding requirements of its end-use applications. As a versatile organic synthesis intermediate, p-Anisidine’s reactivity allows it to be a precursor for a wide array of complex molecules. Its characteristic p-Anisidine chemical properties make it a valuable tool for organic chemists in both research and industrial settings. For professionals seeking to buy p-Anisidine online, ensuring the product comes from a reputable p-Anisidine CAS 104-94-9 supplier is essential for guaranteed quality and consistency. The chemical industry relies on a steady supply of well-characterized intermediates like p-Anisidine to drive innovation and production. Its dual role in the vibrant dye sector and the critical pharmaceutical industry underscores its significance. By understanding and leveraging its chemical properties, manufacturers can continue to unlock new applications and optimize existing processes.