Description

Benzotriazole-4-Sulfonic Acid is a versatile and highly functionalized heterocyclic sulfonic acid derivative, serving as a key synthetic intermediate and building block in advanced chemical manufacturing. Its value lies in the unique reactivity imparted by the fused benzotriazole ring system combined with a strongly acidic sulfonic acid group, enabling precise chemical transformations. This compound is essential for researchers and manufacturers in the pharmaceutical, agrochemical, and specialty chemical industries who require a high-purity, reliable precursor for the synthesis of complex molecules, dyes, and corrosion inhibitors.

Application

• Pharmaceutical Intermediate: A critical building block for the synthesis of active pharmaceutical ingredients (APIs), particularly those containing benzotriazole or sulfonamide moieties.
• Agrochemical Synthesis: Used in the production of advanced herbicides, fungicides, and plant growth regulators where its structural features contribute to biological activity.
• Corrosion Inhibitor Precursor: Acts as a key starting material for manufacturing high-performance benzotriazole-based corrosion inhibitors for metals, especially in cooling water systems and industrial fluids.
• Dye and Pigment Manufacturing: Employed in the synthesis of azo dyes and other complex colorants, where the sulfonic acid group enhances water solubility and dyeing properties.
• Polymer Additive Synthesis: Used to create UV stabilizers, antioxidants, and other functional additives for plastics and coatings.
• Research & Development: A valuable reagent in organic synthesis and medicinal chemistry for constructing novel heterocyclic compounds and exploring structure-activity relationships.

Basic Information

Product Name	Benzotriazole-4-Sulfonic Acid
CAS No.	26725-50-8
Molecular Formula	C₆H₅N₃O₃S
Molecular Weight	199.19 g/mol
Synonyms	4-Sulfobenzotriazole; 1H-Benzotriazole-4-sulfonic Acid; Benzotriazole-4-sulphonic Acid; 4-Benzotriazolesulfonic Acid; 1,2,3-Benzotriazole-4-sulfonic Acid; BTA-4-Sulfonic Acid; 4-Carboxybenzotriazole (related); 1H-1,2,3-Benzotriazole-7-sulfonic Acid (tautomer)
EINECS	Contact for details

Quality Control

Our Benzotriazole-4-Sulfonic Acid is manufactured under a strict quality management system. Every batch undergoes rigorous analytical testing to ensure it meets high-purity standards suitable for demanding synthetic applications. A comprehensive Certificate of Analysis (COA) detailing purity, identity, and impurity profiles is provided with each shipment. We adhere to cGMP principles where applicable to guarantee consistency, traceability, and reliability for our global B2B customers.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled 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 incompatible materials.

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
Related Substances (HPLC)	Individual impurity ≤ 0.5%; Total impurities ≤ 2.0%

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