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3'-bromo-[1,1'-biphenyl]-4-carbaldehyde; CAS No.: 400749-87-3; 3'-bromo-[1,1'-biphenyl]-4-carbaldehyde. PROPERTIES: This brominated biphenyl aldehyde is a pale yellow solid with molecular formula C13H9BrO. It has molecular weight of 273.12 g/mol and melting point between 85-90 C. The compound is moderately soluble in hot ethanol and methylene chloride but has limited water solubility. Recommended storage is in tightly sealed containers at 2-8 C to prevent oxidation of the aldehyde group. Being an aldehyde, it may cause skin burns and eye damage; use in well-ventilated areas with appropriate PPE is essential. APPLICATIONS: In pharmaceutical manufacturing, this compound serves as intermediate for producing anticancer agents. The bromine substituent provides site for bioisosteric replacement during lead optimization while the aldehyde group enables formation of hydrazones and oximes with therapeutic potential (Journal of Medicinal Chemistry). In materials science, it acts as building block for producing liquid crystalline materials where the biphenyl structure contributes to mesophase formation and the aldehyde group enables further functionalization through reductive amination (Liquid Crystals). Additionally, it functions as starting material for producing fluorescent probes where the aldehyde group reacts with aminofluorophores to form Schiff bases (Analytical Chemistry). These applications highlight its utility as versatile building block with multiple reaction sites for constructing pharmaceuticals and functional materials.