Overview
Quinoline is a nitrogen-containing heterocyclic compound derived from coal tar or synthesized via the Skraup reaction. It serves as a foundational structure for many alkaloids and industrial chemicals. Its aromaticity and basicity make it valuable in organic synthesis and specialty chemical production. First isolated in 1834 by Friedlieb Runge, quinoline is now produced on an industrial scale for applications in pharmaceuticals, dyes, and agrochemicals. Its derivatives, such as quinine and chloroquine, are historically significant in medicine.
Physical and Chemical Properties
Quinoline is a colorless to yellowish liquid with a pungent, pyridine-like odor. It is weakly basic (pKa ~4.9) and forms stable salts with strong acids. The compound is hygroscopic and oxidizes slowly in air, turning darker over time. Its solubility profile includes miscibility with most organic solvents but limited solubility in water (0.6 g/100 mL at 20°C). The molecular structure features a benzene ring fused to a pyridine ring, contributing to its aromatic stability and reactivity in electrophilic substitutions.
Main Applications
In pharmaceuticals, quinoline is a precursor to antimalarial drugs (e.g., quinine derivatives) and antibacterial agents. Its derivatives are also used in cancer research and as antiseptics. The dye industry utilizes quinoline to produce cyanine dyes and photo-sensitizers. In agrochemicals, it acts as an intermediate for fungicides and pesticides. Additionally, it serves as a corrosion inhibitor in metalworking fluids and a solvent for resins and terpenes.
Safety and Storage
Quinoline is toxic if inhaled, ingested, or absorbed through skin. Exposure may cause respiratory irritation, liver damage, or central nervous system effects. Always use fume hoods and wear nitrile gloves, chemical goggles, and respirators when handling. Store in sealed containers under inert gas (e.g., nitrogen) to prevent oxidation. Keep away from strong acids and oxidizers due to potential exothermic reactions. Spills should be contained with inert absorbents and disposed of as hazardous waste.
B2B Procurement Guide
When sourcing quinoline, prioritize suppliers with ISO certification and batch-specific COAs (Certificates of Analysis). Key specifications include purity (≥98%), water content (<0.5%), and absence of heavy metals. Bulk buyers should negotiate pricing for drum (200 kg) or tanker quantities. Consider regional logistics—China and India are major producers. For specialty grades (e.g., USP for pharmaceuticals), expect higher costs and longer lead times.
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