Description

2-Hydroxy-5-Nitro-α-Toluenesulfonic Acid is a specialized aromatic sulfonic acid derivative, valued for its dual functional groups which make it a versatile intermediate in fine chemical synthesis. Its primary commercial importance lies in its role as a key building block for the production of dyes, pigments, and advanced pharmaceutical intermediates. This compound is essential for manufacturers and R&D laboratories in the chemical, pharmaceutical, and agrochemical sectors seeking to develop or produce complex, high-value molecules.

Application

• Dye and Pigment Intermediate: Serves as a crucial precursor in the synthesis of azo dyes and other complex colorants.
• Pharmaceutical Synthesis: Used as a building block for creating active pharmaceutical ingredients (APIs) and other bioactive molecules.
• Agrochemical Manufacturing: Acts as an intermediate in the production of certain herbicides, fungicides, and plant growth regulators.
• Chemical Research & Development: Employed in organic synthesis for introducing sulfonic acid and nitro-substituted phenolic moieties.
• Photographic Chemicals: Can be utilized in the formulation of certain light-sensitive compounds and developers.
• Polymer Modification: Used to introduce functional groups into polymers to alter solubility or reactivity.

Basic Information

Product Name	2-Hydroxy-5-Nitro-α-Toluenesulfonic Acid
CAS No.	18690-42-1
Molecular Formula	C7H7NO6S
Molecular Weight	233.20 g/mol
Synonyms	5-Nitro-2-hydroxybenzenemethanesulfonic acid; 2-Hydroxy-5-nitrobenzylsulfonic acid; (5-Nitro-2-hydroxyphenyl)methanesulfonic acid; 2-Hydroxy-5-nitro-α-toluenesulfonic acid; Benzenemethanesulfonic acid, 2-hydroxy-5-nitro-; 5-Nitrosalicylaldehyde sulfonic acid (related intermediate); α-Toluenesulfonic acid, 2-hydroxy-5-nitro-
EINECS	Contact for details

Quality Control

Our 2-Hydroxy-5-Nitro-α-Toluenesulfonic Acid is manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing to ensure it meets precise specifications for purity, identity, and impurity profiles. Certificates of Analysis (COA) documenting these results are available for every shipment upon request, providing full traceability and compliance assurance for your quality protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). Keep away from strong bases, strong oxidizing agents, and sources of ignition. Due to its aromatic nitro and sulfonic acid groups, it is recommended to handle and store this material with appropriate chemical safety precautions.

Specification

Item	Specification
Appearance	Yellow to light brown crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 1.0%
Sulfated Ash	≤ 0.5%
Heavy Metals (as Pb)	≤ 20 ppm

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.