2,3-Dimethyloxirane
2,3-Dimethyloxirane (CAS: 3266-23-7), also known as 2-Butene oxide, is an organic epoxide with the molecular formula C4H8O and a molecular weight of 72.11 g/mol. This flammable liquid serves as a valuable building block in organic synthesis. Its epoxide ring is susceptible to nucleophilic attack, making it a versatile intermediate for creating more complex molecules across various chemical research and development sectors.
- IUPAC
- 2-Butene oxide
- Synonyms
- 2-Butene oxide2,3-Epoxybutane

Organic Synthesis Intermediate
Utilised as a reactive intermediate in the synthesis of diverse organic compounds. Its epoxide functionality allows for ring-opening reactions to introduce hydroxyl groups or form carbon-carbon bonds.
Building Block for Fine Chemicals
Serves as a fundamental building block for the construction of more complex molecules within the fine chemical industry. It is employed in multi-step syntheses requiring precise functional group manipulation.
Epoxide Chemistry Research
A useful reagent for academic and industrial research focused on exploring epoxide reactivity and developing novel synthetic methodologies. Its structure provides a platform for studying stereoselective reactions.
| Molecular weight | 72.11 |
|---|---|
| Empirical formula | C4H8O |
| Assay | ≥97.0% (GC) |
| Density | 0.804 g/mL at 20 °C(lit.) |


Hazard statements
- H225Highly flammable liquid and vapour
- H315Causes skin irritation
- H319Causes serious eye irritation
- H335May cause respiratory irritation
Precautionary statements
- P210Keep away from heat, sparks and open flames. No smoking
- P261Avoid breathing dust, fume, gas or vapours
- P305IF IN EYES
| Protective equipment | Eyeshields, Faceshields, full-face respirator (US), Gloves, multi-purpose combination respirator cartridge (US) |
|---|---|
| Flash point | -26 °C / -14.8 °F |
| Transport (UN / ADR) | UN 3271 3 / PGII |
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | F,Xi |
| Risk statements (R) | 11-36/37/38 |
| Safety statements (S) | 16-26-36 |
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 2,3-Dimethyloxirane used for?
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2,3-Dimethyloxirane is primarily used as a building block and intermediate in organic synthesis, particularly in the fine chemical and research sectors. Its reactive epoxide ring allows for the creation of more complex organic molecules.
What is the CAS number and molecular formula for 2,3-Dimethyloxirane?
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The CAS number for 2,3-Dimethyloxirane is 3266-23-7, and its molecular formula is C4H8O.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies 2,3-Dimethyloxirane with a minimum assay of 97.0% (GC). We do not represent this product as USP, BP, EP, or any other pharmacopoeia grade.
What are the primary safety concerns when handling 2,3-Dimethyloxirane?
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2,3-Dimethyloxirane is a highly flammable liquid and vapour (H225), and causes skin irritation (H315), serious eye irritation (H319), and may cause respiratory irritation (H335). Appropriate personal protective equipment, including eye protection, gloves, and respiratory protection, must be used. It should be handled in a well-ventilated area away from ignition sources.
How is 2,3-Dimethyloxirane packed and shipped?
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2,3-Dimethyloxirane is shipped as UN 3271, Class 3, Packing Group II, adhering to all relevant transportation regulations for flammable liquids.
How can I request a sample or quote for 2,3-Dimethyloxirane?
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To request a sample or a quote, please contact our sales team through the website or by phone, providing your specific requirements.
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