2,3-dimethyloxirane
Also known as: 2,3-Epoxybutane, 2,3-Butylene Oxide, 2,3-dimethyloxirane, 2-Butene oxide, beta-Butylene oxide, Pseudobutylene Oxide, cis-2,3-epoxybutane, trans-butene oxide, butane-2,3-epoxide, MFCD00066345
2,3-dimethyloxirane (CAS 3266-23-7) is a compound in the Ethers category listed in the Jingsj chemical database. It has the molecular formula C4H8O and a molecular weight of 72.106 g/mol. Key properties include a melting point of 56-57°C (lit.), a boiling point of 56.5±0.0 °C at 760 mmHg, a density of 0.9±0.1 g/cm3 and a flash point of -21.7±0.0 °C. It is classified under GHS with signal word Danger and hazard statements H225 — Highly flammable liquid and vapour, H315 — Causes skin irritation and H319 — Causes serious eye irritation. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 3266-23-7
- Jingsj CID
- J-26734-2
- Molecular Formula
- C4H8O
- Molecular Weight
- 72.106 g/mol
- Category
- Ethers
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 56-57°C (lit.) |
|---|---|
| Boiling Point | 56.5±0.0 °C at 760 mmHg |
| Density | 0.9±0.1 g/cm3 |
| Flash Point | -21.7±0.0 °C |
| Exact Mass | 72.057518 |
| PSA | 12.53000 |
| LogP | 0.80 |
| Vapor Pressure | 239.2±0.1 mmHg at 25°C |
| Refractive Index | 1.396 |
GHS Safety & Compliance
- H225 — Highly flammable liquid and vapour
- H315 — Causes skin irritation
- H319 — Causes serious eye irritation
- H335 — May cause respiratory irritation
Frequently Asked Questions
What is the CAS number of 2,3-dimethyloxirane?
The CAS number of 2,3-dimethyloxirane is 3266-23-7.
What are the molecular formula and molecular weight of 2,3-dimethyloxirane?
2,3-dimethyloxirane has molecular formula C4H8O and molecular weight 72.106 g/mol.
Is 2,3-dimethyloxirane hazardous?
2,3-dimethyloxirane has GHS signal word Danger and hazard statements H225 — Highly flammable liquid and vapour; H315 — Causes skin irritation; H319 — Causes serious eye irritation.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "2,3-dimethyloxirane (CAS 3266-23-7)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-26734-2 (accessed 2026-11-06).
Data for reference only; verify product details with suppliers before purchase.