C4H4Na2O92H2O

C4H4Na2O92H2O is a chemical compound with the molecular formula C4H4Na2O9·2H2O. It is a sodium salt of a tetracarboxylic acid, specifically sodium 2,3-dihydroxyterephthalate dihydrate. This compound is often used in the synthesis of polymers and resins, particularly in the production of polyesters and polyamides. Its structure consists of a central benzene ring with four carboxylic acid groups, two of which are esterified with sodium ions, and two water molecules of hydration.

The synthesis of C4H4Na2O9·2H2O typically involves the reaction of terephthalic acid with sodium hydroxide, followed by the addition of water to form the dihydrate. The resulting compound is a white, crystalline powder that is soluble in water and many organic solvents. It is stable under normal conditions but may decompose upon heating or exposure to strong acids.

C4H4Na2O9·2H2O is used as a monomer in the production of various polymers, including polyesters and polyamides. These polymers find applications in textiles, coatings, and adhesives due to their excellent mechanical properties and resistance to chemicals and moisture. The compound's sodium ions contribute to its solubility and reactivity, making it a valuable intermediate in chemical synthesis.

In summary, C4H4Na2O9·2H2O is a sodium salt of 2,3-dihydroxyterephthalic acid, used primarily in the synthesis of polymers and resins. Its chemical structure and properties make it a useful compound in various industrial applications.