Overview
4-Aminophenol (p-Aminophenol) is an aromatic organic compound featuring both amine and hydroxyl functional groups. It is a key intermediate in the synthesis of pharmaceuticals, particularly paracetamol (acetaminophen), accounting for over 70% of its global demand. The compound’s redox properties also make it valuable in dye manufacturing and photographic development. First synthesized in the late 19th century, 4-aminophenol is produced industrially via the reduction of nitrobenzene or hydrolysis of 4-chloronitrobenzene. Its commercial importance stems from its versatility as a building block in fine chemicals and its role in cross-coupling reactions.
Physical and Chemical Properties
4-Aminophenol exists as white to light brown crystals that darken upon exposure to air due to oxidation. It sublimes at 284°C and decomposes at higher temperatures, releasing toxic fumes like nitrogen oxides. The compound exhibits moderate solubility in polar solvents, with better dissolution in hot water (50 g/L at 100°C) and ethanol. Chemically, it acts as both a weak acid (pKa ~10.3 for the hydroxyl group) and a weak base (pKa ~5.3 for the amine group). Its redox activity allows it to serve as a reducing agent, but this also necessitates careful handling to prevent degradation. UV-Vis spectroscopy shows strong absorption at 280 nm, indicating its photosensitivity.
Main Applications
The pharmaceutical industry consumes ~60% of global 4-aminophenol production, primarily for paracetamol synthesis via acetylation. In hair dyes, it functions as a primary intermediate for oxidative coloration, creating shades from blonde to black. Photographic developers utilize its reducing properties to convert silver halides to metallic silver. Other niche uses include rubber antioxidants (where it prevents polymer degradation) and corrosion inhibitors in boiler water treatment. Recent research explores its potential in organic electronics and as a ligand for metal-organic frameworks (MOFs).
Safety and Storage
4-Aminophenol is classified as harmful (H302/H312/H332) and causes skin sensitization (H317). Workplace exposure limits are typically set at 0.5 mg/m³ (respirable dust). Storage requires airtight containers with desiccants, away from oxidizers and strong acids. Facilities should have spill kits with inert absorbents like vermiculite. Personal protective equipment (PPE) must include nitrile gloves, goggles, and NIOSH-approved dust respirators. In case of fire, use dry chemical or CO2 extinguishers—water may spread contamination. Waste disposal must comply with local regulations for aromatic amines.
B2B Procurement Guide
Bulk buyers should prioritize suppliers with batch-specific Certificates of Analysis (CoA) confirming purity (≥98% by HPLC) and heavy metal content (<10 ppm). Pharmaceutical-grade material requires GMP compliance and DMF/ASMF filings. Packaging options include 25 kg fiber drums with polyethylene liners or 1-ton super sacks for large orders. Logistics considerations: Sea freight is cost-effective but demands moisture-controlled containers. Just-in-time delivery minimizes storage risks. Spot prices fluctuate with phenol and nitrobenzene feedstock costs—long-term contracts (6–12 months) can hedge against volatility.
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