Description

5-Hydroxy-2-Methylbenzenesulfonic Acid is a versatile aromatic sulfonic acid derivative that serves as a critical intermediate in advanced organic synthesis. Its value lies in its dual functionality, combining a phenolic hydroxyl group with a strongly acidic sulfonic acid group, enabling its use in the creation of complex molecules. This compound is essential for manufacturers in the pharmaceutical, agrochemical, and specialty dye industries who require high-purity building blocks for active ingredient development and fine chemical production.

Application

• Pharmaceutical Intermediate: Key building block in the synthesis of active pharmaceutical ingredients (APIs), particularly for compounds requiring a sulfonated aromatic core.
• Agrochemical Synthesis: Used in the production of herbicides, fungicides, and plant growth regulators where the sulfonic acid group enhances solubility and bioavailability.
• Dye and Pigment Manufacturing: Acts as an intermediate for azo dyes and other colorants, contributing to chromophore development and improving dye fastness.
• Chemical Research & Development: Valuable reagent in organic chemistry labs for introducing sulfonic acid groups into complex molecular architectures.
• Polymer Modification: Can be used to synthesize sulfonated polymers or as a monomer for specialty resins with ion-exchange properties.
• Catalyst and Ligand Preparation: Serves as a precursor for creating metal-chelating ligands or acidic catalysts used in various organic transformations.

Basic Information

Product Name	5-Hydroxy-2-Methylbenzenesulfonic Acid
CAS No.	102014-39-1
Molecular Formula	C7H8O4S
Molecular Weight	188.20 g/mol
Synonyms	2-Methyl-5-hydroxybenzenesulfonic acid; 5-Hydroxy-o-toluenesulfonic acid; 2-Methyl-5-sulfophenol; 2-Methylresorcinol-5-sulfonic acid; 5-Hydroxy-2-methylphenylsulfonic acid; 2-Methyl-5-hydroxybenzene-1-sulfonic acid; 5-Hydroxy-2-methyl-1-benzenesulfonic acid
EINECS	Contact for details

Quality Control

Our 5-Hydroxy-2-Methylbenzenesulfonic Acid is produced under a strict quality management system to ensure batch-to-batch consistency and high purity. Each lot undergoes comprehensive analytical testing, including HPLC for assay and impurity profiling. Certificates of Analysis (COA) detailing purity, identity, and specific impurity limits are provided with every shipment to support your quality assurance and regulatory compliance needs.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at a controlled room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept sealed when not in use 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%
Residue on Ignition	≤ 0.1%
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.