Description

Chlorosulfonyl Isocyanate is a highly reactive, versatile chemical intermediate essential for introducing the chlorosulfonyl and isocyanate functional groups into target molecules. Its unique bifunctional reactivity makes it a critical building block for synthesizing complex heterocyclic compounds and specialty chemicals. This product is primarily sought by research institutions and manufacturers in the pharmaceutical, agrochemical, and polymer industries for developing advanced materials and active ingredients.

Application

• Pharmaceutical Intermediate: Key reagent in the synthesis of sulfonylurea and sulfonamide-based drug candidates, including diuretics and antidiabetic agents.
• Agrochemical Synthesis: Used to create herbicidal and pesticidal compounds, particularly those containing sulfonylurea bridges.
• Polymer Modification: Serves as a monomer or cross-linking agent for producing specialty polymers with enhanced thermal or chemical resistance.
• Heterocyclic Chemistry: Fundamental building block for constructing β-lactams, sultams, and other nitrogen-sulfur-oxygen containing ring systems.
• Chemical Research & Development: A valuable tool for organic synthesis in academic and industrial R&D labs for exploring new molecular entities.
• Dye and Pigment Manufacturing: Intermediate in the production of certain specialized colorants and functional dyes.

Basic Information

Product Name	Chlorosulfonyl Isocyanate
CAS No.	1189-71-5
Molecular Formula	CClNO3S
Molecular Weight	141.53 g/mol
Synonyms	Chlorosulfonyl isocyanate; CSI; Isocyanatosulfonyl chloride; Sulfonyl isocyanate chloride; Chlorosulfonylcarbimide; NSC 9375; Chlorosulfonyl carbonimide
EINECS	214-719-6

Quality Control

Our Chlorosulfonyl Isocyanate is manufactured under stringent process controls to ensure batch-to-batch consistency and high purity. Quality is verified through a comprehensive suite of analytical tests including chromatography (GC/HPLC) and spectroscopic methods. A detailed Certificate of Analysis (COA) is provided with each shipment, confirming compliance with agreed specifications. We adhere to a robust quality management system to meet the exacting standards of our global B2B clientele.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at temperatures between 2°C and 8°C (refrigerated). Due to its highly volatile and hygroscopic nature, containers must be kept tightly sealed under a dry inert atmosphere (e.g., nitrogen or argon) to prevent moisture absorption and decomposition. Keep away from strong bases, alcohols, and amines.

Specification

Item	Specification
Appearance	Clear, colorless to pale yellow liquid
Identification (IR)	Conforms
Assay (GC)	≥ 98.0 %
Density (at 20°C)	1.62 - 1.65 g/mL
Boiling Point	107 - 108 °C

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