What is Sodium 6-Hydroxy-2-Naphthalenesulfonate and how is it identified?

Sodium 6-hydroxy-2-naphthalenesulfonate is a naphthalene sulfonate intermediate with CAS 135-76-2, molecular formula C₁₀H₇NaO₄S and molecular weight 246.21. It is also called Schaeffer's salt or sodium 2-naphthol-6-sulfonate.

Which specifications should be confirmed when purchasing Schaeffer's Salt?

Confirm assay, appearance, moisture, related naphthalenesulfonate isomers and residual inorganic salts. The batch analysis should state the actual purity because this intermediate is used for controlled diazo coupling and dye synthesis.

What is Sodium 6-Hydroxy-2-Naphthalenesulfonate used for?

It is mainly used as a dye intermediate, including in the synthesis of Sunset Yellow FCF and related azo colorants. The hydroxyl and sulfonate positions control coupling selectivity and color development.

How should Sodium 6-Hydroxy-2-Naphthalenesulfonate be stored and handled?

Store in tightly closed containers in a cool, dry, ventilated area away from strong oxidizers and incompatible materials. Use dust controls, appropriate PPE and the current safety information for spill, exposure and disposal procedures.

Why is the 6-hydroxy-2-sulfonate substitution pattern important?

The 6-hydroxy group acts as the naphthol coupling position and the 2-sulfonate improves water solubility and directs the diazo coupling site. This substitution pattern supports selective azo formation for dyes such as Sunset Yellow FCF.

Sodium 6-Hydroxy-2-Naphthalenesulfonate CAS 135-76-2

Sodium 6-Hydroxy-2-Naphthalenesulfonate, CAS 135-76-2, is a naphthalenesulfonate dye intermediate commonly known as Schaeffer’s Salt, used mainly in the synthesis of Sunset Yellow FCF and related azo colorants. Confirm the required assay and isomer profile for the intended synthesis.

CAS: 135-76-2
Synonyms: Schaeffer's Salt, Sodium 2-naphthol-6-sulfonate, 6-Hydroxy-2-naphthalenesulfonic acid sodium salt, Sodium 6-hydroxynaphthalene-2-sulfonate
Einecs: 205-218-1
Molecular Formula: C₁₀H₇NaO₄S
Grade: Industrial grade 99%
Package: 25kg/barrel

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Product Description

Sodium 6-Hydroxy-2-Naphthalenesulfonate, CAS 135-76-2, is a naphthalenesulfonate dye intermediate commonly known as Schaeffer’s salt; the EC/EINECS number is 205-218-1.

Synonyms: Schaeffer’s Salt; Sodium 2-naphthol-6-sulfonate; 6-Hydroxy-2-naphthalenesulfonic acid sodium salt; Sodium 6-hydroxynaphthalene-2-sulfonate.

CAS: 135-76-2.

Molecular formula: C₁₀H₇NaO₄S.

Molecular weight: 246.21.

EC number: 205-218-1.

It is normally supplied as a gray-white solid with an assay of about 99%.

It is mainly used as a dye intermediate, including in the synthesis of Sunset Yellow FCF and related azo colorants.

The 6-hydroxy group acts as the naphthol coupling position and the 2-sulfonate improves water solubility and directs the diazo coupling site for selective azo formation.

Confirm assay, appearance, moisture, related naphthalenesulfonate isomers and residual inorganic salts.

Store in tightly closed containers in a cool, dry, ventilated area away from strong oxidizers and incompatible materials, and use dust controls with appropriate PPE.

Confirm the current product-specific specification.

Confirm packaging with the requested quantity and destination requirements.

Document requirements should be confirmed from the current specification, SDS, COA, or other product-specific files.

Regulated-use suitability must be confirmed separately with current product-specific documentation.

The page is an RFQ entry point and does not state stock, price, MOQ, or fixed lead time.

For an RFQ, state the intended use, required specification, quantity, packaging, destination, and document needs.

FAQ - Technical & Supply Chain

Q:
What is Sodium 6-Hydroxy-2-Naphthalenesulfonate and how is it identified?

A: Sodium 6-hydroxy-2-naphthalenesulfonate is a naphthalene sulfonate intermediate with CAS 135-76-2, molecular formula C₁₀H₇NaO₄S and molecular weight 246.21. It is also called Schaeffer's salt or sodium 2-naphthol-6-sulfonate.
Q:
Which specifications should be confirmed when purchasing Schaeffer's Salt?

A: Confirm assay, appearance, moisture, related naphthalenesulfonate isomers and residual inorganic salts. The batch analysis should state the actual purity because this intermediate is used for controlled diazo coupling and dye synthesis.
Q:
What is Sodium 6-Hydroxy-2-Naphthalenesulfonate used for?

A: It is mainly used as a dye intermediate, including in the synthesis of Sunset Yellow FCF and related azo colorants. The hydroxyl and sulfonate positions control coupling selectivity and color development.
Q:
How should Sodium 6-Hydroxy-2-Naphthalenesulfonate be stored and handled?

A: Store in tightly closed containers in a cool, dry, ventilated area away from strong oxidizers and incompatible materials. Use dust controls, appropriate PPE and the current safety information for spill, exposure and disposal procedures.
Q:
Why is the 6-hydroxy-2-sulfonate substitution pattern important?

A: The 6-hydroxy group acts as the naphthol coupling position and the 2-sulfonate improves water solubility and directs the diazo coupling site. This substitution pattern supports selective azo formation for dyes such as Sunset Yellow FCF.

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