Overview
2-Nitrobenzoic acid, also known as o-nitrobenzoic acid, is an organic compound derived from benzoic acid with a nitro group substituted at the ortho position. It is primarily used as an intermediate in the synthesis of pharmaceuticals, dyes, and other specialty chemicals. The compound is classified as an aromatic nitro carboxylic acid and exhibits typical properties of both functional groups. Its industrial production involves nitration of benzoic acid or oxidation of 2-nitrotoluene. The material is commercially available in technical and purified grades depending on application requirements.
Physical and Chemical Properties
As a crystalline solid, 2-nitrobenzoic acid appears as pale yellow needles or powder with a characteristic faint odor. The presence of both electron-withdrawing groups (nitro and carboxyl) makes this compound more acidic than benzoic acid itself, with a pKa of approximately 2.17. The compound demonstrates moderate thermal stability, decomposing rather than boiling when heated. Its solubility profile shows good dissolution in polar organic solvents like ethanol and ether, but limited water solubility (about 1.2 g/L at 20°C). The nitro group makes the compound potentially reactive in reduction reactions, while the carboxyl group enables salt formation and esterification.
Main Applications
In pharmaceutical manufacturing, 2-nitrobenzoic acid serves as a key building block for various drug molecules, particularly those containing benzodiazepine or anthranilic acid structures. Its derivatives find use in analgesics, anti-inflammatory agents, and other therapeutic compounds. The dye industry utilizes this chemical as an intermediate for azo dyes and other colorants. Additionally, it functions as a corrosion inhibitor in certain metal treatment processes and as a reagent in organic synthesis laboratories for studying reaction mechanisms or preparing more complex molecules.
Safety and Storage
Proper handling of 2-nitrobenzoic acid requires standard laboratory precautions including gloves, goggles, and protective clothing. The compound may cause skin and eye irritation upon contact, and inhalation of dust should be avoided through proper ventilation or respiratory protection. For storage, keep containers tightly sealed in a cool, dry area away from heat sources and incompatible materials such as strong bases and reducing agents. The substance is relatively stable under recommended storage conditions but may decompose if exposed to prolonged high temperatures or direct sunlight. Shelf life typically exceeds two years when stored properly.
B2B Procurement Guide
When sourcing 2-nitrobenzoic acid for industrial applications, buyers should specify required purity levels (typically 98-99% for technical use, higher for pharmaceutical applications) and request certificates of analysis. Pharmaceutical-grade material requires additional documentation including GMP compliance certificates. Suppliers should demonstrate reliable quality control measures and provide batch-specific test reports. For large-volume purchases (tonnage quantities), negotiate contracts with provisions for regular quality checks and stable pricing over the contract period. Consider establishing relationships with multiple qualified suppliers to mitigate supply chain risks.
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