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4-hydroxypyrimidine-5-carbonitrile; CAS No.: 4774-34-9; 4-hydroxypyrimidine-5-carbonitrile. PROPERTIES: This compound features a 4-hydroxypyrimidine-5-carbonitrile structure, combining a hydroxyl group and a nitrile group on the pyrimidine framework. It typically appears as a white to off-white crystalline solid with a molecular weight of approximately 141.1 g/mol (C5H3N2O). The melting point ranges between 190-195 C, and it exhibits moderate solubility in common organic solvents like ethanol, methanol, and DMSO while being sparingly soluble in water. Proper storage requires a tightly sealed container in a cool, dry place. Safety considerations include wearing appropriate PPE. It is classified as a skin and eye irritant (GHS07) with the hazard statement H315-H319. APPLICATIONS: 4-Hydroxypyrimidine-5-carbonitrile serves as a versatile intermediate in pharmaceutical and chemical synthesis. Its 4-hydroxypyrimidine-5-carbonitrile structure allows for participation in various reactions, including esterification, amide bond formation, and nucleophilic substitution at the pyrimidine ring. In medicinal chemistry, it is used to develop bioactive molecules targeting kinases, proteases, and G protein-coupled receptors. The nitrile group can be hydrolyzed to a carboxylic acid or reduced to an amine for further functionalization. This compound also functions as a building block in the synthesis of fluorescent dyes and bioconjugation reagents. Academic studies employ it as a model compound in Medicinal Chemistry journals, focusing on optimizing the 4-hydroxypyrimidine-5-carbonitrile scaffold for improved biological activity and pharmacokinetic properties.