Description

4-Hydroxy-α-Phenylimino-m-Toluenesulfonic Acid is a specialized organic sulfonic acid derivative characterized by its unique phenylimino and hydroxy functional groups. This compound serves as a critical intermediate and functional additive in advanced chemical synthesis, where its structure enables precise molecular modifications. It is primarily utilized by pharmaceutical, agrochemical, and specialty chemical manufacturers for the development of active ingredients and performance materials.

Application

• Pharmaceutical Intermediate: A key building block in the synthesis of novel active pharmaceutical ingredients (APIs), particularly for compounds requiring sulfonic acid or imino functionalities.
• Agrochemical Synthesis: Used in the production of advanced herbicides, fungicides, and plant growth regulators.
• Dye and Pigment Manufacturing: Acts as an intermediate in the creation of azo dyes and other complex colorants.
• Polymer Modification: Employed as a functional monomer or cross-linking agent to impart specific ionic or solubility properties to polymers.
• Research & Development: Serves as a valuable reagent in organic chemistry research for studying sulfonation and condensation reactions.
• Chemical Synthesis Catalyst/Additive: Functions as an acid catalyst or a stabilizing agent in specific organic transformations.

Basic Information

Product Name	4-Hydroxy-α-Phenylimino-m-Toluenesulfonic Acid
CAS No.	98111-83-2
Molecular Formula	C13H11NO4S
Molecular Weight	277.30 g/mol
Synonyms	4-Hydroxy-α-phenylimino-m-toluenesulfonic acid; Benzenesulfonic acid, 4-hydroxy-α-(phenylimino)-m-tolyl-; α-(Phenylimino)-4-hydroxy-m-toluenesulfonic acid; 4-Hydroxy-α-(phenylimino)-m-toluenesulfonic acid; 3-[(Phenylimino)methyl]-4-hydroxybenzenesulfonic acid; 4-Hydroxy-3-[(phenylimino)methyl]benzenesulfonic acid; (E)-4-Hydroxy-3-((phenylimino)methyl)benzenesulfonic acid
EINECS	Contact for details

Quality Control

Our production of 4-Hydroxy-α-Phenylimino-m-Toluenesulfonic Acid adheres to stringent quality management protocols. Every batch undergoes comprehensive analytical testing, including HPLC for purity and identity confirmation via IR and NMR spectroscopy, to ensure consistent quality and specification compliance. Certificates of Analysis (COA) documenting all critical parameters are available upon request to support your quality assurance and regulatory needs.

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). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept sealed to prevent absorption of atmospheric moisture, which can affect product stability and performance.

Specification

Item	Specification
Appearance	Off-white to light yellow powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 2.0%
Residue on Ignition	≤ 0.5%
Heavy Metals (as Pb)	≤ 20 ppm

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