Molekula
Chlorosulfonyl isocyanate
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 2000 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
Chlorosulfonyl isocyanate is a highly reactive organic compound used in the synthesis of isocyanates, sulfonamides, and other specialty chemicals. In organic synthesis it is a key reagent for building beta-lactam ring systems, important intermediates in pharmaceutical manufacturing. It is a corrosive, moisture-sensitive reagent requiring careful handling. CAS: 1189-71-5, Molecular Formula: ClSO₂NCO, Molecular Weight: 141.53 g/mol. Store at 2 to 8 °C. Signal word: Danger. Molekula supplies Chlorosulfonyl isocyanate from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Example image for illustration only. Other packaging and pack sizes are available.
Pricing & pack sizes
These pack sizes aren't a limit. Molekula manufactures, sources and repacks to order — if you need 500 kg and only see 1 kg listed, . We quote from grams to multi-tonne.
Need a different size? Add the nearest pack and change the size in your basket — we price it at the same rate per unit.
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25 g — £30.90 per pack ex VAT · £37.08 inc. VAT
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Tell us how much you need and when — drums, IBCs, sacks or a one-off bulk lot. We'll manufacture or source it and come back with a price.
Prices exclude VAT/sales tax and shipping.
Specifications
| Property | Value |
|---|---|
| Appearance | Colourless or light yellow transparent liquid |
| Assay | >99% |
| Impurities | <1.0% |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | 2 to 8 °C |
| Flash Point | 110 °C |
| Transport Class | 8 |
| Packing Group | II |
| Acidity | Acid |
Identification
| Property | Value |
|---|---|
| SKU | 56885966 |
| CAS Number | 1189-71-5 |
| IUPAC Name | N-(oxomethylidene)sulfamoyl chloride |
| EC Number | 214-715-2 |
| Molecular Formula | ClSO2NCO |
| Molecular Weight | 141.53 |
| Exact Mass | 140.9287 |
| SMILES | C(=NS(=O)(=O)Cl)=O |
| InChIKey | WRJWRGBVPUUDLA-UHFFFAOYSA-N |
| InChI | InChI=1S/CClNO3S/c2-7(5,6)3-1-4 |
| PubChem CID | 70918 |
| UN Number | UN3265 |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| HTS Code | 2929.10.8090 |
| Tariff Code | 2929100090 |
Safety & GHS
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Corrosive
GHS05
-
Health Hazard
GHS07
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Serious Health Hazard
GHS08
Hazard statements
- EUH014 Reacts violently with water
- H290 May be corrosive to metals
- H302 Harmful if swallowed
- H314 (sub cat. 1B) Causes severe skin burns and eye damage
- H334 May cause allergy or asthma symptoms or breathing difficulties if inhaled
Precautionary statements
- P223 Keep away from any possible contact with water, because of violent reaction and possible flash fire
- P260 Do not breathe dust/fume/gas/mist/vapours/spray
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P301+310 IF SWALLOWED: Immediately call a POISON CENTER or doctor/physician
- P305+351+338 IF IN EYES: Rinse with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing
- P406 Store in a corrosive resistant container with a resistant inner liner
Documents
Safety Data Sheets (SDS)
Available in English, French, German, Italian, Portuguese, Spanish.
Certificate of Analysis (CoA) by batch
Enter a lot or batch number to retrieve the CoA for that specific batch. We can generate one from spec data if no PDF is on file.
Synonyms
- [(CHLOROSULFONYL)IMINO]METHANONE
- Chlorosulphonyl isocyanate
- chlorsulfonyl isocyanate
- N-(oxomethylene)sulfamoyl chloride
- N-(oxomethylidene)sulfamoyl chloride
- N-Carbonylsulfamyl chloride
- N-Chlorosulfonyl isocyanate
- sulfurisocyanatidic chloride
- sulfurisocyanatidoyl chloride
- Sulfuryl chloride isocyanate
Frequently asked questions
What is chlorosulfonyl isocyanate used for?
It is primarily used in organic synthesis for introducing isocyanate and sulfonyl groups, particularly in the production of pharmaceuticals and agrochemicals.
What is the chemical formula and molecular weight?
The formula is ClSO2NCO with a molecular weight of 141.53 g/mol.
How should chlorosulfonyl isocyanate be stored?
It must be stored at temperatures between 2 to 8 °C and protected from light and moisture.
What grade is available?
Molekula supplies chlorosulfonyl isocyanate in high-purity laboratory grade.
Can Molekula supply it in bulk?
Yes, bulk quantities are available upon request; please contact our sales team for details.
What documentation comes with the order?
Each order includes a Certificate of Analysis (CoA) and Safety Data Sheet (SDS) with the shipment.
Ready to order or need a custom pack?
Tell us the product, grade, and quantity — Molekula usually responds within one working day with pricing and lead time.