Description

5-Methyl-2-thiophenesulfonic acid is a versatile organosulfur compound featuring a sulfonic acid group on a substituted thiophene ring. This structure makes it a valuable building block and intermediate in advanced organic synthesis, particularly for introducing sulfonate functionality. It is essential for manufacturers and R&D teams in the pharmaceutical, agrochemical, and specialty chemical sectors who require high-purity, functionalized heterocyclic intermediates for developing active ingredients and novel materials.

Application

• Pharmaceutical Intermediate: Key precursor in the synthesis of active pharmaceutical ingredients (APIs), especially those requiring a bioisostere or a solubilizing sulfonate group.
• Agrochemical Synthesis: Used in creating advanced herbicides, fungicides, and insecticides where the thiophene scaffold contributes to biological activity.
• Ligand and Catalyst Preparation: Serves as a starting material for synthesizing specialized ligands used in catalysis and metal-organic frameworks (MOFs).
• Polymer and Material Science: Functional monomer for producing conductive polymers, ion-exchange resins, and specialty polymers with unique electronic properties.
• Dye and Pigment Manufacturing: Intermediate in the production of complex organic dyes and pigments, particularly sulfur-containing colorants.
• Research & Development: A critical reagent in academic and industrial R&D for exploring new chemical entities and reaction pathways in heterocyclic chemistry.

Basic Information

Product Name	5-Methyl-2-thiophenesulfonic Acid
CAS No.	73348-45-5
Molecular Formula	C5H6O3S2
Molecular Weight	178.23 g/mol
Synonyms	2-Thiophenesulfonic acid, 5-methyl-; 5-Methylthiophene-2-sulfonic acid; 5-Methyl-2-thienylsulfonic acid; 5-Methylthiophene-2-sulphonic acid; 5-Methyl-2-thiophenesulphonic acid; 5-Methyl-2-thienylsulphonic acid; 5-Methyl-2-sulfothiophene
EINECS	Contact for details

Quality Control

Our 5-Methyl-2-thiophenesulfonic acid is produced under a strict quality management system. Every batch undergoes comprehensive analytical testing including HPLC, NMR, and titration to ensure identity, purity, and consistency. A Certificate of Analysis (COA) detailing all specifications is provided with each shipment to guarantee it meets your precise R&D or production requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept sealed 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%
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.