3-Hydroxy-2-naphthoic acid
3-Hydroxy-2-naphthoic acid (CAS 92-70-6), with the molecular formula HOC₁₀H₆CO₂H and a molecular weight of 188.18 g/mol, is a valuable organic compound. It functions primarily as a key intermediate and building block in various chemical synthesis pathways. Its chemical structure lends itself to applications in the development of dyes, pigments, and potentially other specialised organic materials, making it a sought-after reagent in industrial and research settings.
- IUPAC
- β-Hydroxynaphthoic acid
- Synonyms
- 3-Hydroxy-2-naphthalenecarboxylic acid2-Hydroxy-3-naphthoic acidβ-Hydroxynaphthoic acid

Dye and Pigment Intermediate
3-Hydroxy-2-naphthoic acid serves as a crucial precursor in the synthesis of azo dyes and pigments. Its naphthoic acid structure allows for coupling reactions to produce vibrant and stable colourants used across various industries.
Organic Synthesis Building Block
As a functionalised naphthalene derivative containing both a hydroxyl and a carboxylic acid group, it is employed as a versatile building block in complex organic synthesis. It facilitates the introduction of naphthyl moieties into larger molecules.
Chemical Research Reagent
This compound is utilised in academic and industrial research laboratories for exploring new synthetic methodologies and developing novel organic compounds with potentially unique properties.
| Molecular weight | 188.18 |
|---|---|
| Linear formula | HOC10H6CO2H |
| Assay | 98% |
| Grade | technical |
| Melting point | 218-221 °C(lit.) |

Hazard statements
- H302Harmful if swallowed
- H319Causes serious eye irritation
Precautionary statements
- P305IF IN EYES
| Protective equipment | dust mask type N95 (US), Eyeshields, Gloves |
|---|---|
| Flash point | 150 °C / 302 °F |
| Water hazard class (WGK, DE) | 1 |
| Hazard codes (EU) | Xn |
| Risk statements (R) | 22-36 |
| Safety statements (S) | 26 |
| Cation traces | Ba: ≤5.0 mg/kgCa: ≤10 mg/kgCd: ≤5.0 mg/kgCo: ≤5.0 mg/kgCr: ≤5.0 mg/kgCu: ≤5.0 mg/kgK: ≤20 mg/kgMg: ≤5.0 mg/kgMn: ≤5.0 mg/kgNa: ≤10 mg/kgNi: ≤5.0 mg/kgPb: ≤5.0 mg/kgZn: ≤5.0 mg/kg |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
| Absorption | absorption/337 nm ≥1000 (mol. absorption) |
|---|---|
| Analyte Suitability | peptidesproteins |
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-Hydroxy-2-naphthoic acid used for?
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3-Hydroxy-2-naphthoic acid is primarily used as an intermediate and building block in organic synthesis, particularly in the production of dyes and pigments, and as a reagent in chemical research.
What is the CAS number and molecular formula for 3-Hydroxy-2-naphthoic acid?
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The CAS number for 3-Hydroxy-2-naphthoic acid is 92-70-6, and its molecular formula is HOC₁₀H₆CO₂H.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies 3-Hydroxy-2-naphthoic acid with a technical grade and an assay of 98%. TSS does not represent this product as USP, BP, EP, or other pharmacopoeia grades.
What are the key safety hazards associated with 3-Hydroxy-2-naphthoic acid?
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3-Hydroxy-2-naphthoic acid is classified as harmful if swallowed (H302) and causes serious eye irritation (H319). It requires appropriate personal protective equipment, including a dust mask (N95), eyeshields, and gloves, to handle safely.
How is 3-Hydroxy-2-naphthoic acid supplied and exported by TSS?
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Tech Serve Solutions is a global supplier and exporter of fine chemicals, including 3-Hydroxy-2-naphthoic acid, adhering to all necessary regulations for international shipping.
How can I request a quote or sample of 3-Hydroxy-2-naphthoic acid?
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Please contact our sales team via the website or direct enquiry channels to request a quote or a sample of 3-Hydroxy-2-naphthoic acid.
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