Overview
4-Hydroxyquinoline is an organic compound belonging to the quinoline family, characterized by a hydroxyl group at the 4-position. It is widely used as an intermediate in the synthesis of pharmaceuticals, dyes, and agrochemicals. The compound exhibits unique chemical properties, including weak basicity and the ability to form stable complexes with metals, making it valuable in coordination chemistry and industrial applications. 4-Hydroxyquinoline is synthesized through the Skraup reaction or other quinoline derivatization methods. Its versatility and reactivity have led to its use in the development of antimalarial drugs, antimicrobial agents, and fluorescent probes. The compound is typically supplied as a crystalline powder and requires careful handling due to its potential health hazards.
Physical and Chemical Properties
4-Hydroxyquinoline is a pale yellow to brown crystalline solid with a melting point of approximately 200-202°C. It is soluble in polar organic solvents like ethanol and methanol, as well as in hot water, but has limited solubility in cold water. The compound exhibits weak basicity and can form stable complexes with transition metals, which is useful in analytical chemistry and catalysis. One notable property of 4-hydroxyquinoline is its fluorescence in solution, making it useful in biochemical assays and sensing applications. The hydroxyl group at the 4-position enhances its reactivity, allowing for further functionalization through alkylation, acylation, or other chemical modifications. These properties contribute to its widespread use in organic synthesis and industrial processes.
Main Applications
4-Hydroxyquinoline serves as a key intermediate in the pharmaceutical industry, particularly in the synthesis of antimalarial and antibacterial drugs. Its ability to chelate metals makes it valuable in the production of metal-based therapeutics and diagnostic agents. The compound is also used in agrochemicals, such as fungicides and herbicides, due to its bioactive properties. In addition to its pharmaceutical and agrochemical applications, 4-hydroxyquinoline is employed in organic synthesis for the preparation of dyes, fluorescent probes, and coordination complexes. Its fluorescence properties are leveraged in biochemical research for detecting metal ions or studying enzyme activity. The compound's versatility and reactivity ensure its continued relevance in various industrial and scientific fields.
Safety and Storage
4-Hydroxyquinoline should be handled with care to avoid exposure to skin, eyes, or respiratory system. Personal protective equipment (PPE), including gloves, goggles, and lab coats, is recommended when working with this compound. In case of contact, rinse affected areas with plenty of water and seek medical attention if irritation persists. The compound should be stored in a cool, dry, well-ventilated area away from incompatible substances such as strong oxidizers. Proper labeling and containment are essential to prevent accidental misuse or spills. Disposal should comply with local regulations for hazardous chemicals. Suppliers typically provide safety data sheets (SDS) with detailed handling and storage instructions.
B2B Procurement Guide
When procuring 4-hydroxyquinoline, verify the CAS number (611-36-9) to ensure product authenticity. Key specifications to check include purity (typically 98% or higher), moisture content, and residual solvent levels. Reputable suppliers should provide certificates of analysis (CoA) and comply with quality standards such as ISO or GMP. Bulk purchases may offer cost advantages, but ensure proper storage conditions to maintain product integrity. Consider suppliers with a track record of reliable delivery and technical support. For specialized applications, custom synthesis or tailored formulations may be available. Always review safety data and regulatory compliance before finalizing procurement decisions.
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