Description

4-Mercaptobenzenesulfonic Acid is a versatile organosulfur compound featuring both a sulfonic acid and a thiol functional group, making it a valuable building block and intermediate in advanced chemical synthesis. Its unique bifunctional nature allows it to act as a ligand, catalyst, or precursor in the production of specialty chemicals and materials. This product is essential for R&D laboratories and industrial manufacturers in the pharmaceutical, agrochemical, and polymer sectors seeking to develop novel compounds with specific electronic or binding properties.

Application

• Pharmaceutical Intermediate: Used in the synthesis of active pharmaceutical ingredients (APIs), particularly those requiring sulfonamide or disulfide linkages.
• Polymerization Catalyst & Modifier: Serves as a chain transfer agent or catalyst component in the production of specialty polymers and resins.
• Electroplating Additive: Acts as a brightener and leveling agent in electroplating baths for metals.
• Chemical Research & Development: A key reagent for constructing complex molecules in medicinal chemistry and material science.
• Agrochemical Synthesis: Intermediate in the manufacture of certain herbicides and fungicides.
• Surface Modification: Used to create self-assembled monolayers (SAMs) on gold and other surfaces for sensor technology.

Basic Information

Product Name	4-Mercaptobenzenesulfonic Acid
CAS No.	7134-41-0
Molecular Formula	C6H6O3S2
Molecular Weight	190.24 g/mol
Synonyms	p-Mercaptobenzenesulfonic Acid; Benzenesulfonic acid, 4-mercapto-; 4-Sulfanylbenzenesulfonic acid; p-Thiophenolsulfonic Acid; 4-Sulfanyl-1-benzenesulfonic acid; MBTSA; 4-MBSA
EINECS	230-429-4

Quality Control

Our 4-Mercaptobenzenesulfonic Acid is manufactured under a strict quality management system. Every batch is analyzed to ensure it meets high-purity standards suitable for industrial and research applications. Certificates of Analysis (COA) documenting purity, identity, and impurity profiles are available upon request 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 place at room temperature (15-25°C). This material is hygroscopic (moisture-sensitive) and easily oxidized; it is recommended to store under an inert atmosphere such as nitrogen for long-term stability. Keep away from strong acids, bases, and oxidizing agents.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Water Content (KF)	≤ 1.0%
Residue on Ignition	≤ 0.1%

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