6-Amino-4-hydroxy-2-naphthalenesulfonic acid
6-Amino-4-hydroxy-2-naphthalenesulfonic acid (CAS: 90-51-7; Formula: C10H9NO4S) is a key organic building block featuring amine, hydroxyl, and sulfonic acid functional groups on a naphthalene core. With a molecular weight of 239.25 g/mol, this compound serves as a valuable intermediate in various chemical synthesis processes. It is primarily utilised in the production of dyes and other complex organic molecules, contributing to the development of speciality chemicals.
- IUPAC
- 7-Amino-1-naphthol-3-sulfonic acid

Dye Intermediate
This sulfonic acid derivative is extensively employed as a precursor in the synthesis of various azo dyes and other colourants. Its specific structure allows for precise colour development and stability in dyed materials.
Organic Synthesis
As a versatile organic building block, 6-Amino-4-hydroxy-2-naphthalenesulfonic acid is a useful reagent in complex multi-step syntheses. It provides a functionalised naphthalene scaffold for creating novel organic compounds.
Chemical Research
Researchers utilise this compound in academic and industrial laboratories for developing new synthetic methodologies and exploring novel chemical structures. Its reactive functional groups are amenable to various transformations.
| Molecular weight | 239.25 |
|---|---|
| Empirical formula | C10H9NO4S |
| Assay | ≥90% (T) |

Hazard statements
- H314Causes severe skin burns and eye damage
Precautionary statements
- P280Wear protective gloves, clothing and eye/face protection
- P305IF IN EYES
- P310Immediately call a POISON CENTER or doctor
| Protective equipment | Eyeshields, Faceshields, full-face particle respirator type N100 (US), Gloves, respirator cartridge type N100 (US), type P1 (EN143) respirator filter, type P3 (EN 143) respirator cartridges |
|---|---|
| Transport (UN / ADR) | UN 2585 8/PG 3 |
| Water hazard class (WGK, DE) | 1 |
| Hazard codes (EU) | C |
| Risk statements (R) | 34 |
| Safety statements (S) | 26-27-28-36/37/39-45 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is 6-Amino-4-hydroxy-2-naphthalenesulfonic acid used for?
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It is primarily used as an intermediate in the synthesis of dyes and as a versatile building block in organic synthesis and chemical research.
What are the CAS number and formula for 6-Amino-4-hydroxy-2-naphthalenesulfonic acid?
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The CAS number is 90-51-7 and the empirical formula (Hill notation) is C10H9NO4S.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies 6-Amino-4-hydroxy-2-naphthalenesulfonic acid with an assay of ≥90% (T). We do not represent this product as USP, BP, EP, or other pharmacopoeia grades.
What are the main hazards associated with this chemical?
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This compound is classified as corrosive and causes severe skin burns and eye damage (H314). Appropriate personal protective equipment, including eyeshields, gloves, and respiratory protection, must be used when handling.
How is 6-Amino-4-hydroxy-2-naphthalenesulfonic acid typically packaged and shipped?
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It is shipped as UN 2585, Class 8, Packing Group III, indicating it is a corrosive solid, acidic, organic, n.o.s. Packaging adheres to strict international regulations for hazardous materials transport.
How can I request a sample or quote for 6-Amino-4-hydroxy-2-naphthalenesulfonic acid?
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To request a sample or obtain a quotation, please contact our sales department via the website or direct email, providing your specific requirements.
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