Description

4-Hydroxy-2-Methylbenzenesulfonic Acid is a versatile aromatic sulfonic acid derivative that serves as a critical intermediate in fine chemical synthesis. Its value lies in its bifunctional structure, featuring both a phenolic hydroxyl and a sulfonic acid group, enabling its use in coupling reactions and as a building block for more complex molecules. This compound is essential for manufacturers in the agrochemical, pharmaceutical, and specialty dye industries seeking reliable, high-purity intermediates.

Application

• Agrochemical Intermediate: Key precursor in the synthesis of advanced herbicides, fungicides, and plant growth regulators.
• Pharmaceutical Synthesis: Used as a building block for active pharmaceutical ingredients (APIs) and diagnostic agents.
• Dye and Pigment Manufacturing: Serves as an intermediate in the production of azo dyes and other colorants.
• Polymer Modification: Can be used to introduce sulfonate groups into polymers to alter solubility and ionic properties.
• Research & Development: Valuable reagent in organic chemistry R&D for creating novel sulfonated compounds.
• Chemical Synthesis: Acts as a catalyst or reagent in various organic transformations, including esterification and etherification.

Basic Information

Product Name	4-Hydroxy-2-Methylbenzenesulfonic Acid
CAS No.	7134-05-6
Molecular Formula	C7H8O4S
Molecular Weight	188.20 g/mol
Synonyms	2-Methyl-4-hydroxybenzenesulfonic acid; Cresolsulfonic acid; 2-Methyl-4-phenolsulfonic acid; 4-Hydroxy-o-toluenesulfonic acid; o-Cresol-4-sulfonic acid; 2-Methylphenol-4-sulfonic acid; 4-Hydroxy-2-methylphenylsulfonic acid
EINECS	230-426-3

Quality Control

Our 4-Hydroxy-2-Methylbenzenesulfonic Acid is manufactured under a strict quality management system. We provide material that meets exacting standards for purity and consistency, suitable for demanding industrial and research applications. Certificates of Analysis (COA) documenting key parameters such as assay, identity, and impurity profiles are available for every batch upon request.

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). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 2.0%
Residue on Ignition	≤ 0.1%
Heavy Metals (as Pb)	≤ 20 ppm

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