Overview
4-Nitroaniline is an organic compound belonging to the class of nitroaromatic amines. It is primarily used as an intermediate in the synthesis of dyes, pigments, and pharmaceuticals. The compound is characterized by its yellow crystalline appearance and distinct chemical properties, making it valuable in industrial applications. First synthesized in the 19th century, 4-nitroaniline has since become a staple in chemical manufacturing. Its role as a precursor in azo dye production underscores its importance in the textile and coloring industries. The compound's reactivity and stability under controlled conditions further enhance its utility in various chemical processes.
Physical and Chemical Properties
4-Nitroaniline exhibits a molecular weight of 138.12 g/mol and a density of 1.424 g/cm³. It melts at 146-149 °C and decomposes at 332 °C. The compound is slightly soluble in water but dissolves readily in organic solvents like ethanol and ether. Chemically, 4-nitroaniline is an aromatic amine with a nitro group para to the amino group. This configuration influences its reactivity, particularly in electrophilic substitution reactions. The nitro group's electron-withdrawing nature reduces the basicity of the amino group, making it less reactive compared to aniline.
Main Applications
The primary use of 4-nitroaniline is in the production of azo dyes, which are widely employed in textiles, plastics, and inks. Its ability to form stable diazonium salts makes it a key intermediate in dye synthesis. Beyond dyes, 4-nitroaniline serves as a building block in pharmaceutical manufacturing, particularly in the synthesis of sulfa drugs and other medicinal compounds. It is also utilized in chemical research as a reagent for studying nitroaromatic reactions and mechanisms.
Safety and Storage
4-Nitroaniline is classified as toxic and poses health risks upon ingestion, inhalation, or skin contact. It can cause irritation to the skin, eyes, and respiratory tract, and prolonged exposure may lead to more severe health effects, including potential carcinogenicity. Proper storage is essential to mitigate risks. The compound should be kept in a cool, dry, and well-ventilated area, away from oxidizing agents and incompatible materials. Personal protective equipment (PPE), such as gloves and goggles, is recommended when handling 4-nitroaniline.
B2B Procurement Guide
When procuring 4-nitroaniline, buyers should prioritize suppliers with verified certifications and a track record of reliability. Key factors to consider include purity levels (typically 98% or higher), packaging integrity, and compliance with safety regulations. Bulk purchasing can reduce costs, but it's advisable to conduct quality checks upon receipt. Additionally, buyers should ensure that transportation and storage conditions align with safety guidelines to prevent degradation or hazardous incidents.
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