What is Sulfuryl Chloride?

Sulfuryl chloride is an inorganic acid chloride with CAS 7791-25-5 and molecular formula SO₂Cl₂. It is a colorless to pale yellow fuming liquid that reacts rapidly with moisture.

What is Sulfuryl Chloride used for?

It is used as a chlorinating, sulfonating and chlorosulfonating agent in organic synthesis. Typical applications include pharmaceutical, agrochemical, dye, pigment and specialty chemical intermediates.

How is it different from thionyl chloride?

Thionyl chloride is SOCl₂, while sulfuryl chloride is SO₂Cl₂. Both are chlorinating agents, but sulfuryl chloride is often selected for sulfonylation or radical chlorination, whereas thionyl chloride is commonly used to convert carboxylic acids to acyl chlorides.

Why does Sulfuryl Chloride fume or turn yellow?

Sulfuryl chloride reacts rapidly with moisture, releasing hydrogen chloride and sulfuric acid, which causes fuming. Heating can decompose it to sulfur dioxide and chlorine, and the resulting decomposition products can give aged material a yellow color.

How should Sulfuryl Chloride be stored and handled?

Store it in tightly sealed, corrosion-resistant packaging in a cool, well-ventilated area away from water, alcohols, amines, DMSO, DMF, ethers and bases. Use suitable ventilation and PPE, and prevent moisture from entering the container.

Sulfuryl Chloride CAS 7791-25-5

Sulfuryl Chloride (CAS 7791-25-5), also known as sulfonyl chloride, is an inorganic acid chloride used as a chlorinating, sulfonating and chlorosulfonating agent in agrochemical, pharmaceutical, dye and specialty chemical synthesis. Confirm the required grade, then request a quotation with COA/TDS/SDS for bulk supply.

CAS: 7791-25-5
Synonyms: Sulfonyl chloride, Sulfuric oxychloride, Sulphuryl chloride, Dichlorosulfone
Einecs: 232-245-6
Molecular Formula: SO₂Cl₂
Grade: Industrial grade 99%
Package: 200kg iron drum or 50kg plastic drum packing

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Product Description

Sulfuryl Chloride, CAS 7791-25-5, is sulfuryl dichloride, an inorganic acid chloride used as a chlorinating and sulfonating agent; the EC/EINECS number is 232-245-6.

Synonyms: Sulfonyl chloride; Sulfuric oxychloride; Sulphuryl chloride; Dichlorosulfone.

CAS: 7791-25-5.

Molecular formula: SO₂Cl₂.

Molecular weight: 134.97.

EC number: 232-245-6.

It is a colorless to pale-yellow fuming liquid with a pungent odor; the melting point is about -54 °C, the boiling point about 69 °C and the density about 1.67 g/cm³.

It reacts rapidly with water, releasing hydrogen chloride and sulfuric acid; it is corrosive and moisture-sensitive.

It is produced by reaction of sulfur dioxide with chlorine over a catalyst.

It is used as a chlorinating and sulfonating agent in organic synthesis.

Its radical chlorination offers selectivity versus elemental chlorine in aromatic side-chain chlorination.

It is used in agrochemical, pharmaceutical, dye and surfactant synthesis.

Confirm assay, color, chlorinated impurities and acid content.

Store in tightly sealed, corrosion-resistant packaging in a cool, well-ventilated area away from water, alkalis and heat; use ventilation and suitable PPE.

Confirm the current product-specific specification.

Confirm packaging with the requested quantity and destination requirements.

Document requirements should be confirmed from the current specification, SDS, COA, or other product-specific files.

The page is an RFQ entry point and does not state stock, price, MOQ, or fixed lead time.

For an RFQ, state the intended use, required specification, quantity, packaging, destination, and document needs.

FAQ - Technical & Supply Chain

Q:
What is Sulfuryl Chloride?

A: Sulfuryl chloride is an inorganic acid chloride with CAS 7791-25-5 and molecular formula SO₂Cl₂. It is a colorless to pale yellow fuming liquid that reacts rapidly with moisture.
Q:
What is Sulfuryl Chloride used for?

A: It is used as a chlorinating, sulfonating and chlorosulfonating agent in organic synthesis. Typical applications include pharmaceutical, agrochemical, dye, pigment and specialty chemical intermediates.
Q:
How is it different from thionyl chloride?

A: Thionyl chloride is SOCl₂, while sulfuryl chloride is SO₂Cl₂. Both are chlorinating agents, but sulfuryl chloride is often selected for sulfonylation or radical chlorination, whereas thionyl chloride is commonly used to convert carboxylic acids to acyl chlorides.
Q:
Why does Sulfuryl Chloride fume or turn yellow?

A: Sulfuryl chloride reacts rapidly with moisture, releasing hydrogen chloride and sulfuric acid, which causes fuming. Heating can decompose it to sulfur dioxide and chlorine, and the resulting decomposition products can give aged material a yellow color.
Q:
How should Sulfuryl Chloride be stored and handled?

A: Store it in tightly sealed, corrosion-resistant packaging in a cool, well-ventilated area away from water, alcohols, amines, DMSO, DMF, ethers and bases. Use suitable ventilation and PPE, and prevent moisture from entering the container.

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