Description

4-Sulfobenzoate is an important organic sulfonate intermediate with the CAS registry number 636-78-2. This compound is valued for its role as a versatile building block in the synthesis of specialty chemicals, offering a reactive sulfonate group and a benzoate moiety. It is primarily utilized by manufacturers in the pharmaceutical, agrochemical, and dye industries for producing active ingredients, functional additives, and complex organic molecules.

Application

• Pharmaceutical Intermediate: Key starting material or building block in the synthesis of active pharmaceutical ingredients (APIs), particularly for sulfonamide-based drugs.
• Agrochemical Synthesis: Used in the production of herbicides, fungicides, and plant growth regulators where the sulfonate group enhances solubility or biological activity.
• Dye and Pigment Manufacturing: Serves as an intermediate for creating sulfonated azo dyes and other colorants, improving water solubility and fiber affinity.
• Polymer Modification: Incorporated as a functional monomer or additive to introduce sulfonate groups into polymers, altering properties like hydrophilicity or ion-exchange capacity.
• Research & Development: Employed in organic synthesis laboratories for method development and the creation of novel sulfonated compounds for various applications.
• Surfactant and Detergent Industry: Can be used as a precursor for anionic surfactants due to its sulfonic acid functionality.

Basic Information

Product Name	4-Sulfobenzoate
CAS No.	636-78-2
Molecular Formula	C7H5KO5S (Potassium salt) / C7H6O5S (Acid form)
Molecular Weight	232.28 g/mol (Potassium salt) / 202.19 g/mol (Acid form)
Synonyms	Benzoic acid, 4-sulfo-; p-Sulfobenzoic acid; 4-Carboxybenzenesulfonic acid; Benzenesulfonic acid, 4-carboxy-; p-Carboxybenzenesulfonic acid; Potassium 4-sulfobenzoate; 4-Sulfobenzoic acid; 636-78-2
EINECS	211-267-1

Quality Control

Our 4-Sulfobenzoate is produced under a strict quality management system. Each batch undergoes comprehensive analytical testing to ensure it meets precise specifications for identity, purity, and impurity profiles. We provide Certificates of Analysis (COA) with each shipment, detailing results from tests such as HPLC assay, residual solvent analysis, and heavy metal screening. Our quality commitment supports compliance with cGMP and ISO standards for reliable integration into regulated manufacturing processes.

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 quality and handling properties.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to reference spectrum
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 2.0%
Heavy Metals (as Pb)	≤ 20 ppm
Residual Solvents (GC)	Complies with ICH guidelines
pH (5% solution)	Contact for details

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