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4-(but-3-en-1-yloxy)benzoic acid; CAS No.: 115595-27-2; 4-(but-3-en-1-yloxy)benzoic acid. PROPERTIES: This allyloxy-substituted benzoic acid features molecular formula C??H??O? with molecular weight 204.22 g/mol. It generally appears as a white crystalline powder. Soluble in polar aprotic solvents like DMF and DMSO. Melting point approximately 100-105 C. Exhibits IR absorption for carboxylic acid (~2900-2500 cm??) and hydroxyl groups (~3300 cm??). Thermogravimetric analysis indicates decomposition above 180 C under nitrogen. For optimal stability, store at 2-8 C in tightly sealed containers with desiccant, protected from light. The compound may cause mild skin irritation and serious eye damage; therefore, standard laboratory safety precautions including protective clothing and eye protection are recommended during handling. APPLICATIONS: As an allyloxy-substituted benzoic acid, 4-(but-3-en-1-yloxy)benzoic acid is predominantly utilized in the synthesis of UV-absorbing materials. It serves as a key intermediate in constructing benzotriazole-based UV stabilizers, where the allyloxy group provides valuable reactivity for crosslinking and polymerization reactions as demonstrated in materials science research (Polymer Chemistry). Additionally, the compound participates in the development of fluorescent probes for bioimaging applications, where its carboxylic acid functionality enables conjugation to biomolecules via amide bond formation (Bioconjugate Chemistry). In medicinal chemistry, it functions as a building block for constructing kinase inhibitors, where the benzoic acid group forms hydrogen bonds with target enzymes (Journal of Medicinal Chemistry).