Description

4-Methylbenzene-1-Sulfonic Acid is a versatile organic sulfonic acid derivative, serving as a key intermediate and catalyst in advanced chemical synthesis. Its strong acidic properties and solubility in organic solvents make it a valuable reagent for facilitating critical reactions where mineral acids are unsuitable. This compound is essential for manufacturers and R&D laboratories in the pharmaceutical, agrochemical, and specialty chemical sectors seeking reliable and efficient synthetic pathways.

Application

• Pharmaceutical Intermediate: Used in the synthesis of active pharmaceutical ingredients (APIs) and fine chemicals, particularly in esterification and alkylation reactions.
• Catalyst in Organic Synthesis: Acts as an efficient acid catalyst for Friedel-Crafts alkylation, acylation, and various condensation reactions.
• Dye and Pigment Manufacturing: Serves as a sulfonating agent and intermediate in the production of dyes, pigments, and optical brighteners.
• Polymer Industry: Employed as a curing agent for epoxy resins and in the production of ion-exchange resins.
• Agrochemical Synthesis: A key building block in the manufacture of herbicides, fungicides, and other crop protection agents.
• Research & Development: Utilized in academic and industrial labs for method development and exploratory synthesis.

Basic Information

Product Name	4-Methylbenzene-1-Sulfonic Acid
CAS No.	2173098-62-7
Molecular Formula	C7H8O3S
Molecular Weight	172.20 g/mol
Synonyms	p-Toluenesulfonic Acid; Tosic Acid; 4-Toluenesulfonic Acid; PTSA; Toluenesulfonic Acid; p-Toluolsulfonsäure (German); Acide ptoluenesulfonique (French); Ácido p-toluenosulfónico (Spanish)
EINECS	Contact for details

Quality Control

Our 4-Methylbenzene-1-Sulfonic Acid is manufactured under strict quality management systems. Each batch undergoes rigorous analytical testing to ensure it meets high-purity standards suitable for industrial and research applications. A comprehensive Certificate of Analysis (COA) detailing purity, assay, and impurity profiles is provided with every shipment to guarantee traceability and compliance with your specifications.

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). Keep away from heat, sparks, and open flame. Due to its nature as a strong acid/organic solvent, ensure containers are clearly labeled and stored separately from bases, oxidizing agents, and reactive metals.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Melting Point	103 - 107 °C
Water Content (KF)	≤ 1.0%
Sulfated Ash	≤ 0.1%

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