Description

4-Methylbenzenesulfonic Acid is a versatile organic sulfonic acid derivative, valued for its strong acidity and utility as a catalyst and intermediate in fine chemical synthesis. Its effectiveness as a proton source and its solubility in various organic solvents make it a critical reagent for driving complex chemical transformations. This compound is essential for manufacturers and R&D laboratories in the pharmaceutical, agrochemical, and specialty chemical industries seeking reliable and efficient synthetic pathways.

Application

• Acid Catalyst in organic synthesis for esterification, alkylation, and condensation reactions.
• Pharmaceutical Intermediate in the production of active pharmaceutical ingredients (APIs) and fine chemicals.
• Cross-linking Agent and curing catalyst in polymer and resin manufacturing.
• Dye and Pigment Synthesis as a sulfonating agent and process intermediate.
• Laboratory Reagent for analytical procedures and small-scale research synthesis.
• Agrochemical Production as a building block for herbicides and fungicides.

Basic Information

Product Name	4-Methylbenzenesulfonic Acid
CAS No.	1894988-80-7
Molecular Formula	C7H8O3S
Molecular Weight	172.20 g/mol
Synonyms	p-Toluenesulfonic Acid; Tosic Acid; PTSA; 4-Toluenesulfonic Acid; Toluenesulfonic Acid; p-Toluolsulfonsäure; p-Methylbenzenesulfonic Acid; Toluene-4-sulfonic Acid
EINECS	Contact for details

Quality Control

Our 4-Methylbenzenesulfonic Acid is produced under a stringent quality management system. Each batch undergoes comprehensive analytical testing to ensure it meets high-purity standards suitable for industrial and research applications. A Certificate of Analysis (COA) detailing purity, assay, and impurity profiles is provided with every shipment to guarantee traceability and consistency.

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). This product is hygroscopic (moisture-sensitive) and should be handled in a dry environment to prevent degradation.

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%
Heavy Metals (as Pb)	≤ 20 ppm

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