Description

2,7-Naphthalenedisulfonic acid, 3-amino-5-hydroxy- (CAS No. 90-40-4), also known as RR Acid or 2R Acid, is a high-purity organic compound with the molecular formula C₁₀H₉NO₇S₂. This naphthalene-based disulfonic acid derivative is widely utilized as a key intermediate in the synthesis of dyes, pigments, and fluorescent markers due to its reactive amino and hydroxyl functional groups. Its disulfonic acid moieties enhance solubility in aqueous systems, making it ideal for industrial and research applications. Available in powder form with ≥95% purity, this compound is rigorously tested for consistency and quality, ensuring optimal performance in specialized chemical processes. Proper storage in a cool, dry environment is recommended to maintain stability.

Properties

• CAS Number: 90-40-4
• Complexity: 561
• IUPAC Name: 3-amino-5-hydroxy-naphthalene-2,7-disulfonic acid
• InChI: InChI=1S/C10H9NO7S2/c11-8-4-7-5(2-10(8)20(16,17)18)1-6(3-9(7)12)19(13,14)15/h1-4,12H,11H2,(H,13,14,15)(H,16,17,18)
• InChI Key: VNWVMZDJPMCAKD-UHFFFAOYSA-N
• Exact Mass: 318.98204397
• Molecular Formula: C10H9NO7S2
• Molecular Weight: 319.3
• SMILES: C1=C2C=C(C(=CC2=C(C=C1S(=O)(=O)O)O)N)S(=O)(=O)O
• Topological: 172
• Monoisotopic Mass: 318.98204397
• Synonyms: 2,7-Naphthalenedisulfonic acid, 3-amino-5-hydroxy-, 2R Acid, RR Acid, 7-Amino-1-naphthol-3,6-disulfonic acid, EINECS 201-989-3, NSC 10435, 7-Amino-1-hydroxy-3,6-naphthalenedisulfonic acid, DTXSID3059008, 3-Amino-5-hydroxynaphthalene-2,7-disulphonic acid, 3-AMINO-5-HYDROXY-2,7-NAPHTHALENEDISULFONIC ACID, DTXCID4048690, 201-989-3, 90-40-4, 3-amino-5-hydroxynaphthalene-2,7-disulfonic acid, Gamma disulfo acid, 2, 3-amino-5-hydroxy-, 3-Amino-5-hydroxynaphthalene-2,7-disulfonicacid, SCHEMBL943858, SCHEMBL1413196, SCHEMBL7068229, SCHEMBL8821271, NSC7560, NSC-7560, NSC10435, NSC-10435, AKOS016009983, SB83249, NS00039359, 2,7-Naphthalenedisulfonicacid,3-amino-5-hydroxy-, 2-amino-8-hydroxy-6-sulfonaphthalene-3-sulfonic acid

Application

3-Amino-5-hydroxynaphthalene-2,7-disulfonic acid is primarily used as a precursor in the production of azo dyes and reactive dyes, contributing to vibrant colorants for textiles and inks. Its sulfonic acid groups facilitate water solubility, enabling efficient dye formulation processes. Researchers also employ this compound in the development of fluorescent probes for biochemical assays due to its aromatic structure and functional versatility.

Safety and Hazards

GHS Hazard Statements

• H319 (100%): Causes serious eye irritation [Warning Serious eye damage/eye irritation]

Precautionary Statements

• P264+P265, P280, P305+P351+P338, and P337+P317

Hazard Classes and Categories

• Eye Irrit. 2 (100%)

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