Description

2-Thiophenesulfonic Acid is a versatile organosulfur compound that serves as a key building block and intermediate in advanced chemical synthesis. Its value lies in its reactive sulfonic acid group attached to a thiophene ring, making it a crucial precursor for pharmaceuticals, agrochemicals, and specialty materials. This product is essential for R&D chemists and manufacturers in the pharmaceutical, electronics, and fine chemical industries seeking to develop new active ingredients or functional materials.

Application

• Pharmaceutical Intermediate: A critical building block in the synthesis of various active pharmaceutical ingredients (APIs), particularly those containing heterocyclic structures.
• Agrochemical Synthesis: Used in the production of advanced herbicides, fungicides, and insecticides that require a thiophene-based moiety for efficacy.
• Polymer & Material Science: Acts as a monomer or functionalizing agent for creating conductive polymers, ion-exchange resins, and specialty coatings.
• Electronics & Dyes: Employed in the manufacture of organic semiconductors, photoresists, and as an intermediate for sophisticated dyes and pigments.
• Chemical Research & Development: Serves as a fundamental reagent for exploring new synthetic pathways and developing novel compounds in academic and industrial labs.
• Catalyst & Ligand Preparation: Utilized to synthesize specialized ligands and catalysts for metal-complex chemistry and cross-coupling reactions.

Basic Information

Product Name	2-Thiophenesulfonic Acid
CAS No.	79-84-5
Molecular Formula	C4H4O3S2
Molecular Weight	164.20 g/mol
Synonyms	Thiophene-2-sulfonic Acid; 2-Thienylsulfonic Acid; 2-Thiophenesulphonic Acid; Thiophene-2-sulphonic Acid; α-Thiophenesulfonic Acid; 2-Sulfothiophene; Thiophene-2-sulfonate (acid form); 2-Thiophenecarboxylic acid, sulfo- derivative
EINECS	201-233-5

Quality Control

Our 2-Thiophenesulfonic Acid is produced under stringent quality management systems. Every batch undergoes comprehensive analytical testing to ensure high purity and consistency, meeting the rigorous demands of fine chemical and pharmaceutical applications. Certificates of Analysis (COA) detailing purity, identity, and impurity profiles are provided with each shipment to guarantee supply reliability and technical compliance.

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 after opening to prevent degradation from atmospheric moisture.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Water Content (KF)	≤ 2.0%
Residue on Ignition	≤ 0.1%
Heavy Metals (as Pb)	≤ 20 ppm

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