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2,4-dichlorobenzal chloride; CAS No.: 134-25-8;2,4-dichlorobenzal chloride. PROPERTIES: 2,4-dichlorobenzal chloride is a chlorinated aromatic aldehyde chloride with molecular formula C7H4Cl2O. It typically exists as a colorless to pale yellow liquid with a boiling point around 150-155 C. The compound has limited water solubility but dissolves well in organic solvents like chloroform or carbon tetrachloride. It exhibits moderate thermal stability but may decompose when exposed to high temperatures or strong bases, releasing toxic chlorine-containing fumes. Proper storage involves keeping it in tightly sealed containers below 20 C, away from heat sources and incompatible materials. APPLICATIONS: In organic synthesis, this compound serves as a versatile building block for creating complex aromatic systems. The dichloro substituents provide sites for cross-coupling reactions to form biaryl structures, while the aldehyde chloride group enables formation of acyl derivatives or participation in condensation reactions (Tetrahedron Letters). In pharmaceutical research, 2,4-dichlorobenzal chloride contributes to the development of antimicrobial agents where the chlorinated aromatic scaffold enhances binding to microbial targets (Antimicrobial Agents and Chemotherapy). The compound also finds application in materials science as a precursor for creating organic semiconductors with tailored electronic properties, where the electron-withdrawing chlorine atoms modulate charge transport characteristics (Journal of Materials Chemistry C).