3-Hydroxynaphthalene-2,7-disulfonic acid disodium salt
3-Hydroxynaphthalene-2,7-disulfonic acid disodium salt (CAS 135-51-3) is a naphthalene derivative supplied by TSS as a building block for chemical synthesis. With the molecular formula C10H6Na2O7S2 and a molecular weight of 348.26, this compound is typically employed in organic synthesis and related research applications. Its specific chemical structure makes it a valuable intermediate in the preparation of more complex organic molecules.
- IUPAC
- 2-Naphthol-3,6-disulfonic acid disodium salt,Disodium 3-hydroxy-2,7-naphthalenedisulfonate,R-Acid sodium salt
- Synonyms
- C10H6Na2O7S22-Naphthol-3,6-disulfonic acid disodium saltDisodium 3-hydroxy-2,7-naphthalenedisulfonateR-Acid sodium salt

Organic Synthesis Intermediate
3-Hydroxynaphthalene-2,7-disulfonic acid disodium salt serves as a key intermediate in the synthesis of various organic compounds. Its disulfonated naphthalene core offers reactive sites for further chemical modification.
Dye and Pigment Precursor
This compound can be utilised in the synthesis pathway for certain dyes and pigments. The naphthalene structure is a common motif in chromophores, and sulfonation can affect solubility and binding properties.
Research and Development
As a chemical building block, it is valuable in research laboratories for developing new synthetic methodologies or exploring novel chemical entities.
| Molecular weight | 348.26 |
|---|---|
| Empirical formula | C10H6Na2O7S2 |
| Assay | ≥95% (HPLC) |
| Loss on drying | ≤2% loss on drying |

Hazard statements
- H315Causes skin irritation
- H319Causes serious eye irritation
Precautionary statements
- P305IF IN EYES
| Protective equipment | dust mask type N95 (US), Eyeshields, Gloves |
|---|---|
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | Xi |
| Risk statements (R) | 36/38 |
| Safety statements (S) | 26-36 |
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 3-Hydroxynaphthalene-2,7-disulfonic acid disodium salt used for?
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This compound is primarily used as a building block in organic synthesis, potentially as a precursor for dyes and pigments, and in research and development activities.
What are the CAS number and formula for this compound?
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The CAS number is 135-51-3, and the empirical formula (Hill notation) is C10H6Na2O7S2.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies this product with a minimum assay of ≥95% (HPLC). This is a technical/research grade material and is not represented as USP, BP, EP, or any pharmacopoeia grade.
How should 3-Hydroxynaphthalene-2,7-disulfonic acid disodium salt be handled safely?
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This compound is classified as a Warning. It causes skin irritation (H315) and serious eye irritation (H319). Appropriate personal protective equipment, including a dust mask type N95 (US), eyeshields, and gloves, should be worn. In case of eye contact, rinse cautiously with water for several minutes and remove contact lenses if present and easy to do. Continue rinsing.
Is this product suitable for export?
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Yes, Tech Serve Solutions is a specialist global supplier and exporter of fine chemicals, and this product can be packed and shipped internationally.
How can I request a sample or a quote?
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To request a sample or a quote for 3-Hydroxynaphthalene-2,7-disulfonic acid disodium salt, please contact our sales team through the website or by phone.
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