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4-Propoxybenzoic acid; CAS No.: 5438-19-7; 4-Propoxybenzoic acid. PROPERTIES: This substituted benzoic acid is a white crystalline powder with molecular formula C10H10O3. It has molecular weight of 178.18 g/mol and melting point between 100-103 C. The compound is moderately soluble in hot water and ethanol but insoluble in non-polar solvents. Recommended storage is in well-closed containers at room temperature. As an organic acid, it presents typical hazards including skin and eye irritation; standard industrial hygiene practices should be followed. APPLICATIONS: In the polymer industry, this compound serves as monomer for producing polyesters with improved thermal stability. The propoxy group provides flexible ether linkage that enhances polymer chain mobility (Journal of Polymer Science). In pharmaceutical applications, it acts as intermediate for synthesizing non-steroidal anti-inflammatory drugs where the propoxy substituent influences receptor binding affinity (Journal of Medicinal Chemistry). The carboxylic acid group enables formation of prodrugs with improved solubility. Additionally, it functions as building block for producing liquid crystalline materials where the propoxy group contributes to mesophase formation and alignment properties (Liquid Crystals). These applications exploit its combination of aromatic character and alkoxy substituent for constructing functional materials and pharmaceutical agents.