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4-amino-2,5-dichlorophenol; CAS No.: 50392-39-7; 4-amino-2,5-dichlorophenol. PROPERTIES: 4-amino-2,5-dichlorophenol is a yellow crystalline solid with a molecular formula of C6H5Cl2NO. It has a molecular weight of 190.02 g/mol and a melting point of approximately 102-105 C. The compound exhibits low water solubility (approximately 15 mg/L at 25 C) but is soluble in polar organic solvents. It is sensitive to acidic conditions and should be stored in a cool, dry place at temperatures below 20 C in a tightly sealed container. Safety precautions include using gloves and eye protection. It is classified as a category 3 eye irritant under GHS classification. APPLICATIONS: 4-amino-2,5-dichlorophenol serves as a key intermediate in the synthesis of various antifungal agents used in crop protection. Its dichlorophenolic group provides essential lipophilicity for fungicidal activity. In the field of medicinal chemistry, this compound is used in the preparation of anti-inflammatory agents where its amino and chloro groups provide essential functionalities for receptor interactions. It also functions as a building block for the synthesis of fluorescent probes for detecting specific metal ions in biological systems, as reported in Analytical Chemistry. Additionally, the compound is employed in the development of novel chemosensors for explosive detection, where its electron-deficient aromatic system interacts with nitroaromatic explosives to produce visible color changes. Its unique electronic properties make it valuable in the synthesis of organic semiconductors for field-effect transistor applications, as described in Advanced Materials, where its ability to form ordered molecular assemblies enhances charge transport properties.