Isoprene monoxide
Also known as: 2-Methyl-2-vinyloxirane, 2-Vinyl-2-methyloxirane, 2-Ethenyl-2-methyloxirane, Isoprene monoepoxide, 3,4-Epoxy-3-methyl-1-butene, 1,2-Epoxy-2-methyl-3-butene, Oxirane, 2-ethenyl-2-methyl-, MFCD00075225
Isoprene monoxide (CAS 1838-94-4) is a compound in the Aliphatic Hydrocarbons category listed in the Jingsj chemical database. It has the molecular formula C5H8O and a molecular weight of 84.116 g/mol. Key properties include a boiling point of 78.7±9.0 °C at 760 mmHg, a density of 1.0±0.1 g/cm3 and a flash point of -7.8±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.
- 1838-94-4
- Jingsj CID
- J-1991252-8
- Molecular Formula
- C5H8O
- Molecular Weight
- 84.116 g/mol
- Category
- Aliphatic Hydrocarbons
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Boiling Point | 78.7±9.0 °C at 760 mmHg |
|---|---|
| Density | 1.0±0.1 g/cm3 |
| Flash Point | -7.8±0.0 °C |
| Exact Mass | 84.057518 |
| PSA | 12.53000 |
| LogP | 0.51 |
| Appearance | Liquid | Colorless |
| Vapor Pressure | 101.6±0.1 mmHg at 25°C |
| Refractive Index | 1.540 |
| Additional Property | Slightly soluble in water. |
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 Isoprene monoxide?
The CAS number of Isoprene monoxide is 1838-94-4.
What are the molecular formula and molecular weight of Isoprene monoxide?
Isoprene monoxide has molecular formula C5H8O and molecular weight 84.116 g/mol.
Is Isoprene monoxide hazardous?
Isoprene monoxide has GHS signal word Danger and hazard statements H225 — Highly flammable liquid and vapour; H315 — Causes skin irritation; H319 — Causes serious eye irritation.
What are the upstream and downstream products of Isoprene monoxide?
For Isoprene monoxide, Upstream Products: isoprene; Downstream Products: trans-2-Methyl-2-butenal, isoprene, 3-methylpent-1-en-3-ol.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "Isoprene monoxide (CAS 1838-94-4)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1991252-8 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.