Description

Benzenesulfinic Acid CAS NO 618-41-7 is an organosulfur compound characterized by its sulfinic acid functional group attached to a benzene ring. This versatile intermediate is valued for its role as a nucleophile and reducing agent in synthetic organic chemistry. It is primarily sought after by manufacturers in the pharmaceutical, agrochemical, and specialty chemical industries for synthesizing sulfones, sulfonamides, and other fine chemicals.

Application

• Pharmaceutical Intermediate: Key building block in the synthesis of active pharmaceutical ingredients (APIs), particularly those containing sulfone or sulfoxide moieties.
• Agrochemical Synthesis: Used in the production of herbicides, fungicides, and other crop protection agents.
• Polymer & Material Science: Acts as a modifier or chain-transfer agent in polymerization reactions and in the production of specialty polymers.
• Organic Synthesis Reagent: Employed as a mild reducing agent and a nucleophile in various C-S bond-forming reactions and asymmetric synthesis.
• Photographic Chemicals: Utilized in certain developer formulations within the photographic industry.
• Research & Development: Serves as a critical reagent in academic and industrial R&D labs for exploring new synthetic methodologies.

Basic Information

Product Name	Benzenesulfinic Acid
CAS No.	618-41-7
Molecular Formula	C6H6O2S
Molecular Weight	142.18 g/mol
Synonyms	Benzenesulphinic Acid; Phenylsulfinic Acid; Benzenesulfinate; Phenylsulfinate; Benzenesulfinic acid sodium salt (common derivative); Benzenesulphinic acid sodium salt; Sulfinic acid, phenyl-; Benzene sulfinic acid
EINECS	210-548-0

Quality Control

Our Benzenesulfinic Acid is manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing to ensure it meets high-purity standards suitable for industrial and research applications. A comprehensive Certificate of Analysis (COA) detailing purity, identity, and impurity profiles is provided with every shipment to guarantee traceability and compliance.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). This product is easily oxidized (store under inert atmosphere) and light-sensitive (store away from light). Keep away from strong oxidizing agents, strong acids, and heat sources.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Melting Point	82 - 86 °C
Loss on Drying	≤ 1.0 %
Residue on Ignition	≤ 0.1 %

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