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CAS NO.: 5156-00-3; 2-methoxyterephthalic acid. PROPERTIES: This methoxycarboxylic acid features a methoxy group and two carboxylic acid groups on a benzene ring, creating a molecule with potential applications in organic synthesis and polymer science. The 2-methoxyterephthalic acid typically appears as a white crystalline powder with moderate aqueous solubility. Its molecular structure includes a methoxy group that influences the electronic properties of the aromatic system and two carboxylic acid groups that can participate in esterification and polycondensation reactions. For optimal stability, this compound should be stored at 2-8 degree Celsius in a tightly sealed container away from moisture and direct light. When handling, chemists should wear appropriate personal protective equipment including nitrile gloves and safety goggles. This compound is hygroscopic and may form salts upon exposure to atmospheric moisture. In case of accidental ingestion, rinse mouth thoroughly and seek medical attention. APPLICATIONS: The 2-methoxyterephthalic acid serves as a valuable intermediate in the synthesis of polyesters and other polymers where the diacid functionality contributes to polymer chain formation. In polymer science, this compound functions as a monomer for creating polyesters with specific thermal and mechanical properties. The methoxy group can be further modified for additional diversification. Additionally, the molecule finds utility in organic synthesis as a building block for creating complex aromatic acids with diverse biological activities. Researchers utilizing this compound benefit from its functional group versatility, enabling the development of diverse molecular architectures for applications ranging from polymers to pharmaceuticals.