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1-(4-chloro-phenyl)-butane-1,3-dione; CAS No.: 6302-55-2; 1-(4-chloro-phenyl)-butane-1,3-dione. PROPERTIES: 1-(4-Chloro-phenyl)-butane-1,3-dione has molecular formula C10H9ClO2, giving it a molecular weight of 200.63 g/mol. It appears as a white crystalline powder with a melting point between 85-88 C. The compound demonstrates good chemical stability under standard conditions but is sensitive to strong nucleophilic attack. Recommended storage involves keeping it in a sealed container at room temperature (15-25 C) away from strong bases. Safety assessments indicate it may cause eye irritation and has a flash point of approximately 75 C. The compound has a logP value of approximately 2.1 and exhibits moderate aqueous solubility. APPLICATIONS: This 1-(4-chloro-phenyl)-butane-1,3-dione is extensively used in the synthesis of antimicrobial agents. Its phenylbutanedione-chloro structure provides a platform for developing antibacterial agents targeting bacterial DNA gyrase. A study in Antimicrobial Agents and Chemotherapy highlighted its role in creating antibacterial agents with activity against Gram-negative pathogens. In pharmaceutical applications, it serves as a building block for synthesizing kinase inhibitors. The enone and chloro groups provide steric and electronic effects beneficial for optimizing kinase hinge binding. Research in the Journal of Medicinal Chemistry demonstrated its utility in developing JAK3 inhibitors for autoimmune disease therapy. Additionally, the compound is utilized in the preparation of fluorescent dyes. The enone group provides a site for installing fluorescence-enhancing moieties, as reported in Dyes and Pigments.