Dipotassium 2-Naphthol-6,8-disulfonate TCI N0030

Chemical Identity

CAS No.: 842-18-2
PubChem: CID 70050·SID 87573441
Formula: C10H6K2O7S2
Molecular weight: 380.5 g/mol
Purity: >98.0%(HPLC)(T)
Reference databases: ChemSpider·ECHA

Full identifiers (IUPAC, SMILES, InChIKey)

IUPAC: dipotassium;7-hydroxynaphthalene-1,3-disulfonate
SMILES: C1=CC(=CC2=C(C=C(C=C21)S(=O)(=O)[O-])S(=O)(=O)[O-])O.[K+].[K+]
InChIKey: LKDMVWRBMGEEGR-UHFFFAOYSA-L

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TCI N0030 Dipotassium 2-Naphthol-6,8-disulfonate, CAS 842-18-2, is a sulfonated naphthol compound supplied as its dipotassium salt and widely used as a raw material for organic synthesis and as a supporting reagent in laboratory work. Its basic structure is a naphthalene ring carrying one hydroxyl group together with two sulfonate groups. This arrangement allows the compound to act as a classical coupling component in the preparation of azo dyes and as a fluorescent marker in flow-tracing experiments. On the researcher's bench, the material serves as a practical starting point for building more complex aromatic molecules without having to carry out the sulfonation step in-house.

The characteristics that lead researchers to select this compound are the combination of good solubility in aqueous media, conferred by the two anionic sulfonate groups, together with the reactivity of the naphthol hydroxyl group, which remains available for diazo coupling reactions. The dipotassium salt form gives handling stability that is far more convenient than that of the corresponding free sulfonic acid, which is hygroscopic and corrosive. Lot-to-lot quality consistency from TCI helps researchers obtain repeatable results, particularly in colorimetric work and dye synthesis where the outcome depends on the purity of the coupling component.

In Indonesian laboratories, this building block is typically encountered in university chemistry departments, in research institute synthesis groups, and in analytical laboratories that prepare their own colorimetric reagents. It fits routine work in which a water-soluble naphthol coupling partner is needed on a small to moderate scale, and where obtaining the material ready-sulfonated saves considerable preparation time. The compound is ordinarily stored alongside other aromatic intermediates in the general reagent store rather than requiring specialised facilities.

Related TCI products

Azo dye synthesis — the free naphthol hydroxyl group makes this compound a classical coupling component that reacts readily with diazonium salts to form coloured azo products.
Flow-tracing experiments — the fluorescent character of the naphthol system allows the dissolved compound to be followed through aqueous systems, making it useful as a tracer marker.
Organic building block work — the pre-installed sulfonate groups let researchers construct more complex aromatic molecules without performing their own sulfonation step beforehand.
Colorimetric reagent preparation — consistent lot-to-lot quality supports the preparation of reagent solutions whose colour development must be reproducible between separate batches of work.
Aqueous-phase reaction studies — the two anionic sulfonate groups provide good solubility in water-based media, suiting reactions and assays that must be run without organic solvents.

Brand	TCI (Tokyo Chemical Industry)
CAS number	842-18-2
Molecular formula	—
Purity	—
Category	Chemistry > Building Blocks > Non-Heterocyclic Building Blocks
Pack sizes	available in the standard TCI catalogue pack sizes; please confirm the size required when ordering
Physical form	—
Storage	keep in a closed container in a cool, dry place

Chemical form: dipotassium salt of a sulfonated naphthol

Store the container tightly closed in a cool, dry area away from direct sunlight and from sources of heat or moisture. The original supplier container is the most suitable primary packaging; if the material is transferred, use a clean, dry, well-sealed glass or chemically compatible plastic container with a clear label showing the product name and CAS number. Handle the solid in a fume hood or a well-ventilated area to avoid generating or inhaling dust, and wear safety glasses, gloves, and a laboratory coat. Keep the container closed when not in use, since the salt form is best protected from atmospheric moisture. Avoid contact with skin and eyes, wash hands after handling, and consult the manufacturer's safety data sheet before first use and before any disposal step.

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