Overview
2-Pyridone is a nitrogen-containing heterocyclic compound that exists in equilibrium with its tautomer, 2-hydroxypyridine. It is a versatile building block in organic synthesis, particularly in the pharmaceutical and agrochemical industries. The compound's ability to act as both a hydrogen bond donor and acceptor makes it valuable in molecular recognition and catalysis. First synthesized in the late 19th century, 2-pyridone has become a key intermediate for drugs like nalidixic acid and other quinolone antibiotics. Its derivatives are also used in materials science, such as in the development of liquid crystals and polymers.
Physical and Chemical Properties
2-Pyridone is a white crystalline solid with a melting point of 104-107°C. It is moderately soluble in water and highly soluble in polar organic solvents like ethanol and acetone. The compound exhibits tautomerism, interconverting between the keto (2-pyridone) and enol (2-hydroxypyridine) forms, with the keto form being more stable in the solid state. Its aromaticity and polarity contribute to its reactivity in nucleophilic and electrophilic substitution reactions. The NH group in 2-pyridone can participate in hydrogen bonding, making it useful in supramolecular chemistry. The compound is stable under normal conditions but may decompose under strong acids or bases.
Main Applications
The primary use of 2-pyridone is as an intermediate in the synthesis of pharmaceuticals, particularly antibiotics like nalidixic acid and its derivatives. It is also employed in agrochemicals, such as herbicides and fungicides, where its heterocyclic structure enhances bioactivity. In coordination chemistry, 2-pyridone serves as a ligand for metal ions, forming complexes with applications in catalysis and material science. Additionally, it is used in the production of dyes, pigments, and specialty polymers. Recent research explores its potential in drug delivery systems and bioactive materials due to its hydrogen-bonding capabilities.
Safety and Storage
2-Pyridone is classified as an irritant and can cause skin, eye, and respiratory tract irritation. Proper personal protective equipment (PPE), including gloves, goggles, and lab coats, should be worn when handling the compound. Avoid inhalation of dust and ensure adequate ventilation in the workspace. Store 2-pyridone in a tightly sealed container in a cool, dry place, away from direct sunlight and moisture. Incompatible with strong oxidizing agents and acids. In case of spillage, collect the material using appropriate absorbents and dispose of it according to local regulations.
B2B Procurement Guide
When procuring 2-pyridone, prioritize suppliers with certifications like ISO 9001 or GMP to ensure quality and consistency. Key specifications to verify include purity (typically ≥98%), CAS number (142-08-5), and absence of heavy metals or residual solvents. Bulk purchases (e.g., 25 kg drums) may offer cost advantages, but confirm storage compatibility with your facility. Request material safety data sheets (MSDS) and certificates of analysis (CoA) for compliance. For international shipments, ensure proper labeling and adherence to transport regulations (e.g., UN packaging standards).
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