Description

4-Methyl-3-Hydroxybenzenesulfonic Acid is a versatile aromatic sulfonic acid derivative that serves as a key intermediate in the synthesis of more complex organic molecules. Its value lies in its dual functionality, offering both a phenolic hydroxyl group and a strongly acidic sulfonic acid group, which makes it a valuable building block for dyes, pigments, and specialty chemicals. This compound is essential for manufacturers in the fine chemical, pharmaceutical, and agrochemical sectors seeking reliable, high-purity intermediates for their production processes.

Application

• Dye and Pigment Intermediate: A crucial precursor in the synthesis of azo dyes, acid dyes, and other colorants, contributing to chromophore development and solubility.
• Pharmaceutical Synthesis: Used as a building block for creating active pharmaceutical ingredients (APIs) and other pharmacologically active compounds.
• Agrochemical Manufacturing: Serves as an intermediate in the production of herbicides, fungicides, and other crop protection agents.
• Chemical Research & Development: Employed in organic synthesis laboratories for developing new compounds and conducting structure-activity relationship (SAR) studies.
• Polymer Modification: Can be used to introduce sulfonate groups into polymers to alter properties like solubility, hydrophilicity, or ionic character.
• Catalyst and Ligand Synthesis: Useful for preparing sulfonated ligands or organocatalysts used in various chemical transformations.

Basic Information

Product Name	4-Methyl-3-Hydroxybenzenesulfonic Acid
CAS No.	7134-03-4
Molecular Formula	C7H8O4S
Molecular Weight	188.20 g/mol
Synonyms	3-Hydroxy-4-methylbenzenesulfonic Acid; 4-Methyl-3-hydroxybenzenesulphonic Acid; 2-Methyl-5-sulfophenol; 5-Sulfo-2-methylphenol; Cresolsulfonic Acid (mixed isomer reference); m-Cresol-6-sulfonic Acid; 6-Sulfo-m-cresol; 2-Hydroxy-5-methylbenzenesulfonic Acid
EINECS	230-428-7

Quality Control

Our 4-Methyl-3-Hydroxybenzenesulfonic Acid is produced under a stringent quality management system. Each batch undergoes rigorous analytical testing to ensure it meets precise specifications for purity, identity, and impurity profiles. We provide comprehensive Certificates of Analysis (COA) with each shipment, detailing results from tests including assay, related substances, and residual solvents. Our quality commitment ensures consistency and reliability for your critical B2B applications.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled 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. Keep away from strong bases and oxidizing agents.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 2.0%
Related Substances (HPLC)	Total impurities ≤ 2.0% Any single impurity ≤ 1.0%
Sulfated Ash	≤ 0.1%

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