Description

Bis(4-Methylbenzene-1-Sulfonic Acid) CAS NO 2231673-65-5 is a specialized aromatic sulfonic acid derivative, serving as a versatile and potent acid catalyst and building block in advanced organic synthesis. Its value lies in its dual sulfonic acid functionality, which provides enhanced acidity and reactivity compared to monosulfonic analogs, enabling efficient catalysis and the formation of complex molecular architectures. This compound is essential for research chemists and process development scientists in the pharmaceutical, agrochemical, and specialty polymer industries, where it is used to facilitate critical synthetic transformations.

Application

• Acid Catalyst in Organic Synthesis: Employed as a strong, non-volatile acid catalyst for esterification, condensation, and rearrangement reactions.
• Pharmaceutical Intermediate: Used in the synthesis of active pharmaceutical ingredients (APIs) and other bioactive molecules requiring sulfonic acid or sulfonate ester functionalities.
• Polymerization Catalyst & Monomer: Acts as a catalyst in polycondensation reactions or serves as a monomer for producing sulfonated polymers with ion-exchange properties.
• Crosslinking Agent: Utilized in the production of resins and advanced materials where its bifunctional nature can create polymeric networks.
• Chemical Research & Development: A key reagent in academic and industrial R&D for exploring new synthetic methodologies and material science applications.
• Dye & Pigment Manufacturing: Involved in the synthesis of sulfonated dyes and pigments, improving solubility and application properties.

Basic Information

Product Name	Bis(4-Methylbenzene-1-Sulfonic Acid)
CAS No.	2231673-65-5
Molecular Formula	C14H14O6S2
Molecular Weight	342.38 g/mol
Synonyms	4,4'-Dimethyldiphenyl disulfonic Acid; Bis(p-toluenesulfonic Acid); Di(p-tolyl) Disulfonic Acid; p-Toluenesulfonic Acid Dimer; 1,1'-(Disulfonylbis(4,1-phenylene))dimethanesulfonic Acid (alternative IUPAC); DITOSIC ACID (abbrev.); Bis(4-methylbenzenesulfonic acid)
EINECS	Contact for details

Quality Control

Every batch of Bis(4-Methylbenzene-1-Sulfonic Acid) is produced and tested under a strict quality management system. We ensure compliance with relevant industry standards and customer-specific requirements. Comprehensive analytical testing, including assay, impurity profiling, and identity confirmation, is performed. Certificates of Analysis (COA) documenting all test results are available upon request to guarantee traceability and product integrity for your applications.

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. 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)	≤ 10 ppm

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