Description

2-Hydroxy-4-Methylbenzenesulphonic Acid is a versatile aromatic sulfonic acid derivative that serves as a critical intermediate in fine chemical synthesis. Its value lies in its dual functionality, combining a phenolic hydroxyl group with a strongly acidic sulfonic acid group, enabling its use in various coupling and derivatization reactions. This compound is essential for manufacturers in the agrochemical, pharmaceutical, and specialty dye industries seeking to produce high-performance active ingredients and colorants.

Application

• Agrochemical Intermediate: Key building block for the synthesis of advanced herbicides, fungicides, and plant growth regulators.
• Pharmaceutical Synthesis: Used as a precursor or coupling agent in the manufacture of certain active pharmaceutical ingredients (APIs).
• Dye and Pigment Manufacturing: Acts as an intermediate in the production of azo dyes and other complex colorants.
• Chemical Research & Development: Serves as a versatile reagent in organic synthesis for introducing sulfonic acid groups.
• Polymer Modification: Can be used to impart sulfonation and enhance properties in specialty polymers.
• Catalyst and Ligand Synthesis: Useful in the preparation of metal-complexing agents and acidic catalysts.

Basic Information

Product Name	2-Hydroxy-4-Methylbenzenesulphonic Acid
CAS No.	22356-80-5
Molecular Formula	C7H8O4S
Molecular Weight	188.20 g/mol
Synonyms	4-Methyl-2-hydroxybenzenesulfonic acid; 2-Hydroxy-p-toluenesulfonic acid; Cresolsulfonic acid (mixed isomer reference); p-Cresol-2-sulfonic acid; 4-Methylsalicylic acid sulfonic acid; 6-Methyl-3-hydroxybenzenesulfonic acid; 2-Hydroxy-4-methylbenzene-1-sulfonic acid; 4-Methylsalicylic acid sulfonate
EINECS	244-919-5

Quality Control

Our 2-Hydroxy-4-Methylbenzenesulphonic Acid is manufactured under a strict quality management system. Each batch undergoes comprehensive analytical testing to ensure identity, purity, and consistency. We provide a detailed Certificate of Analysis (COA) with every shipment, documenting key parameters such as assay, impurity profile, and physical characteristics. Our quality commitment supports applications requiring reliable and traceable raw materials.

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). This product is hygroscopic (moisture-sensitive) and a strong acid; ensure containers are kept tightly sealed to exclude moisture and stored separately from bases and reactive materials.

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%
Sulfated Ash	≤ 0.1%
Heavy Metals	≤ 20 ppm

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