4-Methylphthalic Anhydride, a derivative of phthalic anhydride, is a chemical compound of significant interest in organic synthesis and material science. Its unique structural features, particularly the presence of a methyl group, impart specific reactivity and properties that make it a valuable intermediate for various industrial applications. Understanding its chemistry is key for researchers and procurement specialists looking to leverage its potential. If you are seeking to purchase this compound, understanding its CAS number (19438-61-0) is the first step in finding reliable suppliers.

Chemically, 4-Methylphthalic Anhydride (C9H6O3) is a cyclic anhydride derived from 4-methylphthalic acid. It typically presents as a solid, often described as crystalline powder or flakes, with a characteristic appearance ranging from white to yellow-orange. Its molecular weight is approximately 162.14 g/mol, and it possesses a defined melting point, usually around 88-93°C. This compound's structure features an anhydride functional group fused to a benzene ring with a methyl substituent. This configuration makes it reactive towards nucleophiles, a property fundamental to its use in synthesis.

The applications of 4-Methylphthalic Anhydride are diverse and driven by its reactive nature. It serves as a crucial building block in the synthesis of advanced materials, including high-performance polymers, specialized resins, and innovative coatings. For instance, it plays a role in the creation of polyesters and alkyd resins, where it contributes to enhanced flexibility, improved impact resistance, and greater thermal stability compared to materials derived from unsubstituted phthalic anhydride. These enhanced properties are highly sought after in industries such as automotive, construction, and electronics.

For businesses looking to buy 4-Methylphthalic Anhydride, sourcing from reliable manufacturers is paramount. The global chemical market offers numerous options, and it is important to identify suppliers who can guarantee high purity (e.g., 96% or 98% minimum) and consistent quality. When seeking a manufacturer, consider their production capacity, quality control measures, and customer service. Companies based in China are often prominent suppliers, offering competitive pricing and the ability to handle large orders. Requesting a quote from these manufacturers will provide insights into current market prices and availability.

The price of 4-Methylphthalic Anhydride is a significant factor in procurement decisions. While specific pricing varies based on purity, volume, and market demand, obtaining detailed quotations from multiple suppliers is recommended. Many suppliers will provide technical data sheets and safety data sheets (SDS) along with their quotes, offering comprehensive information about the product's properties and handling procedures. This due diligence ensures that buyers make an informed decision, balancing cost with the critical need for a high-quality, reliable chemical intermediate.

In conclusion, 4-Methylphthalic Anhydride is a valuable organic intermediate with a well-defined chemical profile and significant applications in advanced materials. Its purchase, driven by the need for specialized polymers and resins, should be approached with careful consideration of its properties, the reliability of manufacturers and suppliers, and current market pricing. By partnering with trusted sources, companies can effectively integrate this compound into their research and production processes.