Description

p-Cresolsulphonic Acid is a versatile aromatic sulfonic acid derivative, serving as a key intermediate and catalyst in advanced organic synthesis. Its strong acidic nature and solubility in organic media make it a valuable reagent for facilitating challenging chemical transformations. This compound is essential for manufacturers in the pharmaceutical, agrochemical, and specialty chemical industries seeking efficient and reliable synthetic building blocks.

Application

• Pharmaceutical Intermediate: Used in the synthesis of active pharmaceutical ingredients (APIs), particularly for compounds requiring sulfonation or as an acid catalyst in complex multi-step reactions.
• Catalyst in Organic Synthesis: Acts as a Brønsted acid catalyst for esterification, alkylation, and condensation reactions, offering advantages in selectivity and reaction rate.
• Dye and Pigment Manufacturing: Serves as a key intermediate in the production of sulfonated dyes, optical brighteners, and other colorants.
• Resin and Polymer Modification: Employed to introduce sulfonic acid groups into polymer chains, enhancing properties like hydrophilicity or ion-exchange capacity.
• Agrochemical Synthesis: Utilized in the manufacture of certain herbicides, fungicides, and plant growth regulators.
• Electroplating Additive: Functions as a brightening agent and leveler in electroplating baths to improve the quality of metal deposits.
• Laboratory Reagent: Used in research and development as a specialized acidic reagent for analytical procedures and small-scale synthesis.

Basic Information

Item	Detail
Product Name	p-Cresolsulphonic Acid
CAS No.	28519-04-2
Molecular Formula	C7H8O4S
Molecular Weight	188.20 g/mol
Synonyms	4-Methylbenzenesulfonic Acid; p-Toluenesulfonic Acid, Cresol Sulfonic Acid; 4-Cresolsulfonic Acid; p-Cresol-4-sulfonic Acid; 4-Hydroxymethylbenzenesulfonic Acid; Tosic Acid (related); PCSA
EINECS	Contact for details

Quality Control

Our p-Cresolsulphonic Acid is produced under a stringent quality management system to ensure batch-to-batch consistency and reliability. The product undergoes comprehensive analytical testing, including assay, impurity profiling, and physical characterization, to meet exacting customer requirements. A Certificate of Analysis (COA) detailing all test results is provided with each shipment to guarantee 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). Due to its hygroscopic (moisture-sensitive) nature, containers must be kept tightly sealed after opening to prevent absorption of atmospheric moisture. Keep away from strong bases and oxidizing agents.

Specification

Item	Specification
Appearance	White to off-white crystalline powder or lumps
Identification (IR)	Conforms to structure
Assay (Titration)	≥ 98.0%
Water Content (KF)	≤ 2.0%
Melting Point	Contact for details
Sulfated Ash	≤ 0.1%
Heavy Metals (as Pb)	≤ 10 ppm

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