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Specifications
| Appearance | Off-white to brown powder |
| Purity | 99% min |
| Identification | Retention time of sample should match that of the standard |
| Water content | 1% max |
| Residue on ignition | 0.3% max |
| Total impurity | 1% max |
| Impurity about 1.7 | 0.4% max |
| Other single impurity | 0.2% max |
Applications
4-Amino-3-chlorophenol hydrochloride (CAS 52671-64-4) is an aromatic amine used primarily as an intermediate in pharmaceuticals, dyes, and cosmetic formulations. In medicinal chemistry, it serves as a building block for the synthesis of active pharmaceutical ingredients, including analgesics, antiseptics, and other bioactive compounds where the amino and hydroxyl functionalities contribute to biological activity. In the dye and pigment industry, it is employed in producing colorants that require substituted phenolic structures, providing stability and desired chromophoric properties. Additionally, it is used in cosmetic chemistry, particularly in hair dyes and topical formulations, where the compound acts as a reactive intermediate for oxidative coloring agents.
Benefits
The benefits of 4-amino-3-chlorophenol hydrochloride arise from its multifunctional reactivity and structural features. The amino group allows for acylation, alkylation, and condensation reactions, while the hydroxyl group enables etherification, esterification, or coupling reactions. The chlorine substituent offers additional chemical versatility for selective substitution or cross-coupling reactions. The hydrochloride salt form improves solubility, stability, and ease of handling compared to the free base. Together, these features allow efficient synthesis of complex molecules with bioactivity, colorant properties, or functional chemical utility, making it a valuable intermediate across multiple industries.
Conclusion
In summary, 4-amino-3-chlorophenol hydrochloride is a versatile intermediate applied in pharmaceuticals, dyes, and cosmetic chemistry. Its applications include drug synthesis, colorant production, and hair dye intermediates, while its benefits lie in multifunctional reactivity, enhanced stability, and ease of handling in hydrochloride form. With these properties, it remains an important tool for chemical synthesis and industrial formulation development.
