Chlorosulfonyl Isocyanate/ CSI

• Appearance: Clear, colorless to pale yellow liquid

• Assay (GC): ≥ 99.0%

• Density (20°C): ~1.626 g/mL

• Boiling Point: 106 - 108°C

• Refractive Index: n20/D 1.447

• Reactivity: Reacts violently with water (Hydrolyzes to Sulfamoyl Chloride).

A highly reactive electrophilic reagent for advanced synthesis:

• Lithium Battery Electrolytes (LiFSI): Key precursor for synthesizing Bis(fluorosulfonyl)imide (FSI) and its lithium salt (LiFSI). CSI provides the sulfonyl-isocyanate skeleton essential for this next-gen electrolyte.

• Pharmaceuticals (β-Lactams): Widely used in [2+2] cycloaddition reactions with alkenes to form β-lactam rings, a crucial step in synthesizing Cephalosporin antibiotics (e.g., Cefuroxime, Cefoxitin).

• Agrochemicals & Sweeteners: Used to introduce sulfamoyl or carbamoyl groups into complex molecules, such as in the synthesis of Acesulfame K (sweetener) and specific herbicides.

• Burgess Reagent Synthesis: Starting material for the preparation of the Burgess reagent (dehydrating agent).

Storage: Strictly Moisture Free. Store in a cool (2-8°C recommended), dry, well-ventilated area under inert gas (Nitrogen/Argon).