O-Aminophenol is an aromatic amine with a hydroxyl group, featuring the chemical formula C₆H₇NO. It appears as white orthorhombic pyramidal needles or off-white crystals that may turn beige or brown upon exposure to air or light. This compound exhibits both acidic and basic properties due to its amino and phenolic groups, making it an essential intermediate in organic synthesis.
Synonyms: 2-Aminophenol; Ortho Amino Pheno; 2-Amino Phenol
Technical Specifications
| ITEMS | INDEX VALUE |
| Appearance | Offwhite crystal |
| Content | ≥99.0% |
| Moisture | ≤0.5% |
| Ash Content | ≤0.3% |
| Melting Point | 171.0-176.0℃ |
Package & Storage
Net weight 25kgs plastic woven bag.
Store in tightly closed containers in a cool, dry, ventilated area away from oxidants, acids, light, and food. Protect from air exposure to prevent darkening.
Applications of O-Aminophenol
O-Aminophenol serves as a critical building block in various industries due to its reactivity and ability to form heterocycles and complexes.
Dye Manufacturing:
Used in the synthesis of azo dyes, sulfur dyes, and metal-complex dyes for textiles, leather, furs, and hair coloring. It provides stable, dull shades ranging from grays to yellowish-browns.
Photographic Development:
Marketed as Atomal or Ortol, it functions as a reducing agent in black-and-white film processing, enhancing image quality.
Pharmaceutical Intermediates:
Essential for synthesizing heterocyclic compounds like benzoxazoles, phenoxazines, and oxyquinolines, which are used in anti-inflammatory drugs and biologically active molecules.
Other Industrial Uses:
Acts as a corrosion inhibitor in paints and fuels; precursor for fluorescent brighteners, precious metal extraction, and cosmetic hair dyes (deemed safe by Cosmetic Ingredient Review for current practices).
Research and Synthesis:
Employed in forming tridentate ligands for more stable dye complexes and as a reagent in organic chemistry labs.
Frequently Asked Questions (FAQs)
Q: What is O-Aminophenol used for?
A: O-Aminophenol is primarily used as an intermediate in dye synthesis for textiles and hair products, as a photographic developer, and in pharmaceutical manufacturing for heterocyclic compounds. It also serves as a reducing agent and corrosion inhibitor.
Q: Is O-Aminophenol the same as 2-Aminophenol?
A: Yes, O-Aminophenol refers to ortho-Aminophenol, which is synonymous with 2-Aminophenol. It is distinct from its isomers like 3-Aminophenol (meta) and 4-Aminophenol (para).
Q: What are the safety precautions for handling O-Aminophenol?
A: Handle with PPE in ventilated areas to avoid inhalation or skin contact. It is harmful if swallowed or inhaled and may cause genetic defects. Store away from light and oxidants.
Q: How should O-Aminophenol be stored?
A: Store in a cool, dark, well-ventilated place in sealed containers to prevent oxidation and discoloration.
Q: Is O-Aminophenol soluble in water?
A: It is slightly soluble in cold water but more soluble in hot water, alcohols, and organic solvents like ethanol and acetone.
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