Description

4-Hydroxy-2-Methylbenzenesulfonic Acid is a versatile aromatic sulfonic acid derivative that serves as a key intermediate in advanced organic synthesis. Its molecular structure, featuring both a phenolic hydroxyl and a sulfonic acid group, makes it a valuable building block for creating complex molecules with specific functional properties. This compound is essential for manufacturers in the pharmaceutical, agrochemical, and specialty chemical industries seeking to develop new active ingredients or functional materials.

Application

• Pharmaceutical Intermediate: A crucial precursor in the synthesis of active pharmaceutical ingredients (APIs), particularly for compounds requiring a sulfonated phenolic moiety.
• Agrochemical Synthesis: Used in the production of herbicides, fungicides, and plant growth regulators where its acidic and aromatic properties are leveraged.
• Dye and Pigment Manufacturing: Acts as an intermediate for sulfonated azo dyes and other colorants, providing water solubility and ionic character.
• Polymer Modification: Employed to introduce sulfonic acid groups into polymers, enhancing properties like hydrophilicity, ion-exchange capacity, or catalytic activity.
• Chemical Research & Development: Serves as a model compound or starting material in organic chemistry research for studying sulfonation reactions and acid catalysis.
• Surfactant and Detergent Intermediate: Can be used in the synthesis of specialized surfactants due to its anionic sulfonate group.

Basic Information

Product Name	4-Hydroxy-2-Methylbenzenesulfonic Acid
CAS No.	132281-59-5
Molecular Formula	C7H8O4S
Molecular Weight	188.20 g/mol
Synonyms	2-Methyl-4-hydroxybenzenesulfonic Acid; p-Cresolsulfonic Acid (isomer); 2-Methyl-4-phenolsulfonic Acid; 4-Hydroxy-o-toluenesulfonic Acid; 2-Methylphenol-4-sulfonic Acid; 4-Hydroxy-2-methylphenylsulfonic Acid; 2-Methyl-4-sulfophenol
EINECS	Contact for details

Quality Control

Our 4-Hydroxy-2-Methylbenzenesulfonic Acid is produced under strict quality management systems. Each batch undergoes rigorous analytical testing to ensure identity, purity, and consistency. We provide comprehensive Certificates of Analysis (COA) with key parameters including assay, impurity profile, and physical characteristics. Our quality commitment aligns with cGMP principles where applicable, ensuring reliability for critical applications in regulated industries.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area away from incompatible materials such as strong bases and oxidizing agents. Due to its strong acid/organic solvent nature, ensure containers are made of compatible materials (e.g., glass or specific plastics) and are clearly labeled. Recommended storage temperature is 15-25°C.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 1.0%
Residue on Ignition	≤ 0.1%
Heavy Metals	≤ 20 ppm
Related Substances (HPLC)	Individual impurity ≤ 0.5%; Total impurities ≤ 1.5%

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