Description

Chloromethanesulfonic Acid is a versatile organosulfur compound with significant utility as a strong acid catalyst and a reactive intermediate in organic synthesis. Its unique structure, featuring both a chloromethyl group and a sulfonic acid moiety, makes it a valuable building block for introducing functional groups and for specialized esterification and alkylation reactions. This chemical is essential for research and development laboratories, as well as industrial-scale production in the pharmaceutical, agrochemical, and specialty chemical sectors seeking to create novel sulfonate derivatives.

Application

• Pharmaceutical Intermediate: Serves as a key precursor in the synthesis of active pharmaceutical ingredients (APIs), particularly for sulfonamide-based drugs and other molecules requiring a sulfonic acid or chloromethyl functional handle.
• Agrochemical Synthesis: Used in the manufacture of herbicides, fungicides, and plant growth regulators where its reactive groups facilitate the creation of complex bioactive molecules.
• Catalyst & Reagent: Functions as a strong acid catalyst in esterification, condensation, and polymerization reactions within fine chemical production.
• Chemical Research: A valuable reagent in academic and industrial R&D for exploring new synthetic pathways and developing novel organic compounds.
• Polymer Modification: Employed to introduce sulfonic acid groups into polymers, potentially altering properties like hydrophilicity or ionic conductivity.
• Dye & Pigment Manufacturing: Acts as an intermediate in the synthesis of certain sulfonated dyes and colorants.

Basic Information

Product Name	Chloromethanesulfonic Acid
CAS No.	40104-07-2
Molecular Formula	C1H3ClO3S / CH2ClSO3H
Molecular Weight	130.55 g/mol
Synonyms	Chloromethylsulfonic Acid; (Chloromethyl)sulfonic Acid; Monochloromethanesulfonic Acid; CMSA; Chloromethanesulphonic Acid; Chloromethylsulphonic Acid; α-Chloromethanesulfonic Acid; NSC 402124
EINECS	254-818-7

Quality Control

Our Chloromethanesulfonic Acid is manufactured under strict quality management protocols. Each batch undergoes rigorous analytical testing to ensure it meets high-purity standards suitable for synthetic applications. A comprehensive Certificate of Analysis (COA) detailing purity, identity, and impurity profiles is provided with every shipment to guarantee traceability and batch-to-batch consistency for our customers.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area away from incompatible materials such as strong bases and oxidizing agents. Due to its hygroscopic (moisture-sensitive) nature, containers should be kept sealed under an inert atmosphere (e.g., nitrogen) for long-term storage to maintain product integrity. Recommended storage temperature is 2-8°C.

Specification

Item	Specification
Appearance	Colorless to pale yellow liquid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Water Content (KF)	≤ 1.0%
Chloride Content	≤ 0.5%
Sulfate Content	≤ 0.1%

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