Description

4-Bromobenzenesulfonic Acid Monohydrate is a versatile organosulfur compound that serves as a key building block in advanced chemical synthesis. Its value lies in its dual functionality, combining a reactive bromo substituent with a strongly acidic sulfonic acid group, enabling a wide range of electrophilic and nucleophilic transformations. This compound is essential for researchers and manufacturers in the pharmaceutical, agrochemical, and specialty chemical industries who require a reliable intermediate for creating complex molecules, dyes, and functional materials.

Application

• Pharmaceutical Intermediate: A crucial precursor in the synthesis of active pharmaceutical ingredients (APIs), particularly for molecules requiring a brominated aromatic sulfonate moiety.
• Agrochemical Synthesis: Used in the production of herbicides, fungicides, and other crop protection agents where the bromine atom facilitates further coupling reactions.
• Dye and Pigment Manufacturing: Acts as a starting material or intermediate for synthesizing brominated sulfonated dyes and colorants.
• Polymer Modification: Employed to introduce sulfonic acid groups into polymers, enhancing properties like hydrophilicity or ion-exchange capacity.
• Chemical Research & Development: A valuable reagent in organic synthesis labs for constructing complex aromatic systems via Suzuki, Heck, or other cross-coupling reactions.
• Catalyst and Ligand Preparation: Serves as a precursor for synthesizing metal-organic catalysts and specialized ligands used in homogeneous catalysis.

Basic Information

Product Name	4-Bromobenzenesulfonic Acid Monohydrate
CAS No.	138-36-3
Molecular Formula	C6H5BrO3S · H2O
Molecular Weight	253.08 g/mol
Synonyms	p-Bromobenzenesulfonic Acid Monohydrate; Benzenesulfonic Acid, 4-bromo-, Monohydrate; 4-Bromophenylsulfonic Acid Hydrate; 1-Bromo-4-sulfobenzoic Acid (obsolete); 4-BBSA; Bromobenzene-4-sulfonic Acid; p-Bromophenylsulfonic Acid
EINECS	205-327-4

Quality Control

Our 4-Bromobenzenesulfonic Acid Monohydrate is produced under a strict quality management system. Every batch undergoes comprehensive analytical testing, including HPLC for purity and identity confirmation via IR and NMR spectroscopy, to ensure it meets the high standards required for research and industrial synthesis. A detailed Certificate of Analysis (COA) is provided with each shipment, documenting key parameters such as assay, water content, and impurity profiles.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly 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 structure
Assay (HPLC)	≥ 98.0%
Water Content (KF)	6.0 - 8.0% (Theoretical for monohydrate: ~7.1%)
Melting Point	Contact for details
Heavy Metals	< 20 ppm
Residue on Ignition	< 0.1%

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