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5-Norbornene-2-carboxylic acid; CAS No.: 10138-32-6; 5-Norbornene-2-carboxylic acid. PROPERTIES: This norbornene-substituted carboxylic acid features molecular formula C?H?O? with molecular weight 124.14 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 norbornene ring stretches. 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 a norbornene-substituted carboxylic acid, 5-Norbornene-2-carboxylic acid is predominantly utilized in the synthesis of polymerizable monomers. It serves as a key intermediate in constructing norbornene-based polymers, where the norbornene ring provides valuable crosslinking sites for forming thermoset materials as demonstrated in polymer chemistry research (Macromolecules). 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 materials science, it functions as a monomer for preparing polyurethane foams with enhanced thermal stability, where the norbornene ring contributes to improved mechanical properties (Polymer International).