3-Sulfolene
3-Sulfolene (CAS: 77-79-2, C4H6O2S) is a cyclic sulfone with a molecular weight of 118.15 g/mol. This compound serves as a versatile intermediate and building block in organic synthesis. Its applications span various chemical reactions, particularly in the creation of heterocyclic compounds and sulfur-containing molecules. It is supplied by Tech Serve Solutions for research and development purposes.
- IUPAC
- 2,5-Dihydrothiophene-1,1-dioxide
- Synonyms
- 2,5-Dihydrothiophene-1,1-dioxide

Dienophile in Diels-Alder Reactions
3-Sulfolene acts as a convenient source of 1,3-butadiene in situ for Diels-Alder reactions. Upon heating, it extrudes sulfur dioxide, generating the reactive diene for cycloaddition with various dienophiles.
Precursor for Heterocyclic Synthesis
The compound is a valuable precursor for constructing various sulfur-containing heterocyclic systems. It can be employed in reactions leading to thiophene derivatives and other cyclic structures.
Organic Synthesis Building Block
As a functionalised cyclic sulfone, 3-Sulfolene can be incorporated into more complex organic molecules. Its reactivity allows for diverse synthetic transformations in multistep syntheses.
| Molecular weight | 118.15 |
|---|---|
| Empirical formula | C4H6O2S |
| Assay | ≥98.0% (GC) |
| Melting point | 64-67 °C |

Hazard statements
- H318Causes serious eye damage
Precautionary statements
- P280Wear protective gloves, clothing and eye/face protection
- P305IF IN EYES
| Protective equipment | dust mask type N95 (US), Eyeshields, Gloves |
|---|---|
| Flash point | 112 °C / 233.6 °F |
| Transport (UN / ADR) | UN 3335 |
| Water hazard class (WGK, DE) | 1 |
| Hazard codes (EU) | Xi |
| Risk statements (R) | 41 |
| Safety statements (S) | 26-37/39 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is 3-Sulfolene used for?
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3-Sulfolene is primarily used as a building block in organic synthesis, particularly as a source of 1,3-butadiene for Diels-Alder reactions and in the synthesis of heterocyclic compounds.
What are the CAS number and formula for 3-Sulfolene?
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The CAS number for 3-Sulfolene is 77-79-2, and its empirical formula is C4H6O2S.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies 3-Sulfolene with an assay of ≥98.0% (GC). This product is supplied for research and development use and is not represented as USP, BP, or EP grade.
What are the main safety hazards associated with 3-Sulfolene?
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3-Sulfolene is classified as Danger with hazard statement H318, indicating it causes serious eye damage. Appropriate personal protective equipment including eyeshields and gloves should be worn during handling.
How is 3-Sulfolene typically packed and exported?
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3-Sulfolene is carefully packed to ensure integrity during transit and is exported globally by Tech Serve Solutions, adhering to all relevant shipping regulations for chemical compounds.
How can I request a sample or quote for 3-Sulfolene?
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To request a sample or a quote for 3-Sulfolene, please contact the Tech Serve Solutions sales team through our website or by phone, providing your contact details and the quantity required.
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