Essential details
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Product Introduction
1. Basic Identification Information
| Parameter | English Specification/Value |
|---|---|
| IUPAC Name | 4-Aminophenol (also: p-Aminophenol; 4-Hydroxyaniline) |
| Common Name(s) | 4-Aminophenol; p-Aminophenol (PAP); 4-Hydroxyaniline; para-Aminophenol; C.I. 76500 (Color Index) |
| CAS Registry Number | 123-30-8 |
| EC/EINECS Number | 204-616-2 |
| Molecular Formula | C₆H₇NO |
| Molecular Weight | 109.13 g/mol |
| Chemical Class | Aminophenol derivative; oxidative hair dye coupler; pharmaceutical intermediate; dye precursor |
| Related Compound | Acetaminophen (Paracetamol, CAS 103-90-2) (acetylated derivative; analgesic/antipyretic drug with low cosmetic use risk) |
2. Physicochemical Properties
| Property Category | Specific Parameter | Specification/Value |
|---|---|---|
| Structural Features | Functional Groups | Amino group (-NH₂) at C4; hydroxyl group (-OH) at C1 on benzene ring (para-substitution; enables intramolecular hydrogen bonding and azo dye coupling) |
| Physical Appearance | State & Color | White to pale gray crystalline powder; turns brown/black rapidly on air/light exposure (oxidation to quinone); faint phenolic/amine odor |
| Melting Point | 189–190 °C (lit.; decomposes slightly above melting point) | |
| Boiling Point | 284 °C (lit.; sublimes at atmospheric pressure; decomposes >300 °C) | |
| Density (25 °C) | 1.29 g/cm³ (crystalline form) |
