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3-Nitropyridine belongs to the family of nitro-substituted pyridines with a nitro group at the 3-position of the heterocyclic aromatic ring. This organic compound appears as a pale yellow crystalline solid and serves as a specialized intermediate in pharmaceutical synthesis and agrochemical manufacturing. Small- to large-scale chemical plants and research labs keep this material on hand for its ability to act as a building block in a wide variety of organic reactions.
At a glance, the molecular formula for 3-Nitropyridine is C5H4N2O2. Looking at the skeletal formula, it features a six-membered aromatic ring with one nitrogen atom at the one position and a nitro functional group (-NO2) at the third position. Its molecular structure directly influences how it behaves in chemical reactions and impacts decisions about safe storage and handling. With a molar mass of about 124.10 g/mol, its solid crystalline appearance results from the planar structure and intermolecular interactions within the molecule.
3-Nitropyridine presents itself as pale yellow flakes or powder in standard containers. Laboratories also find it sometimes in small crystalline pellets or larger granular crystals, depending on the production process and purification steps used. The density stands around 1.38 g/cm3, so it’s compact and settles at the bottom of a container. The melting point sits near 114°C (237°F), and the solid form transitions to a liquid with relatively gentle heating when compared to some other nitroaromatic compounds. It has minimal solubility in water due to the pyridine ring, but organic solvents like ethanol or acetone let it dissolve for experimental needs. As for odors, its sharp scent reflects the presence of the pyridine backbone—strong and unpleasant in closed spaces.
The purity of commercial 3-Nitropyridine often exceeds 98%, characterized by analytical chromatography and careful drying to keep results reliable and safe for sensitive work. Product labels frequently carry both the CAS number (626-00-6) and the HS Code (29333990), so customs officers and importers can track, tax, and regulate chemical shipments across borders. Industries expect full product documentation, including technical data sheets and safety data sheets, as these papers provide all relevant molecular and hazardous material information for compliance and safe use.
Working with 3-Nitropyridine involves genuine risks. The nitro group in the molecule makes it more reactive than basic pyridine, so accidental exposure may lead to acute or chronic health effects. Skin and respiratory irritation occur quickly. Chronic inhalation or accidental ingestion poses more severe toxic effects after repeated or prolonged contact. Its crystalline powder tends to become airborne during weighing or mixing, so workers use fume hoods, gloves, and goggles. Chemical safety data marks it as harmful, and users must respect its hazardous classification under the Globally Harmonized System (GHS). Spills require containment using inert absorbents, with careful cleanup and waste procedures in line with environmental standards.
3-Nitropyridine sits in the toolkit of synthetic chemists for its ability to introduce both nitro and pyridine substructures into targets. The pharmaceutical sector uses it as a starting material or intermediate, helping build up antiviral, antitumor, and anti-inflammatory molecules. The nitro group undergoes reduction or substitution, while the pyridine ring can stabilize drug candidates or functional materials. Crop protection companies use 3-Nitropyridine to create potent herbicides and fungicides with enhanced biological activity. Material scientists and analytical laboratories rely on it for research compounds and performance additives in polymer design, leveraging its unique aromatic and electron-rich structure.
Manufacturers producing 3-Nitropyridine typically start with pyridine raw materials and nitrate under controlled laboratory or plant conditions to minimize byproducts and uncontrolled emissions. Since the chemical features both toxicity and persistence in the environment, legal controls surrounding discharge, incineration, and recycling remain tight across most jurisdictions. Suppliers must invest in modern waste treatment and emissions reduction equipment, as untreated nitroaromatics impact soil and waterways for decades. Knowing the origin, traceability, and safety of raw materials improves end-user confidence and regulatory acceptance. In global trade, the HS Code underpins correct documentation, avoids unnecessary delays, and meets shipper, inspector, and customer requirements.
Safer alternatives or greener synthesis methods for 3-Nitropyridine deserve deeper investment. While established suppliers offer reliable chemical quality along with exhaustive documentation, academic and industry researchers continue to explore ways to lower hazards, reduce toxic solvent use, and recycle solvents on site. Automated handling helps protect workers, and modern sensor-equipped fume extraction units cut exposure to harmful vapors. End users choosing reputable suppliers with solid track records—plus quick response on safety and regulatory questions—tend to avoid hidden risks. Stakeholders across supply chains need to commit to full transparency, invest in improved worker training, and review emergency protocols annually to keep hazards under control in this demanding chemical sector.
