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CAS NO.: 56962-08-4; 4,5-dichlorophthalic acid. PROPERTIES: This dichlorinated aromatic dicarboxylic acid features two chlorine atoms on a phthalic acid framework, creating a molecule with potential applications in organic synthesis and materials science. The 4,5-dichlorophthalic acid typically appears as a white crystalline powder with moderate aqueous solubility. Its molecular structure includes two carboxylic acid groups and chlorine atoms that influence the electronic properties of the aromatic system. 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 4,5-dichlorophthalic 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 chlorine atoms 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.