1-Penten-3-one
Also known as: Ethyl vinyl ketone, EVK, Vinyl ethyl ketone, 1-Penten-3-on, 4-Penten-3-one, Ethenyl ethyl ketone, Pent-1-en-3-one
1-Penten-3-one (CAS 1629-58-9) is a compound in the Ketones 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 104.3±9.0 °C at 760 mmHg, a density of 0.8±0.1 g/cm3 and a flash point of -6.7±0.0 °C. It is classified under GHS with signal word Danger and hazard statements H225 — Highly flammable liquid and vapour, H301 — Toxic if swallowed and H311 — Toxic in contact with skin. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 1629-58-9
- Jingsj CID
- J-29257-5
- Molecular Formula
- C5H8O
- Molecular Weight
- 84.116 g/mol
- Category
- Ketones
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Boiling Point | 104.3±9.0 °C at 760 mmHg |
|---|---|
| Density | 0.8±0.1 g/cm3 |
| Flash Point | -6.7±0.0 °C |
| Exact Mass | 84.057518 |
| PSA | 17.07000 |
| LogP | 0.57 |
| Vapor Pressure | 31.1±0.2 mmHg at 25°C |
| Refractive Index | 1.399 |
GHS Safety & Compliance
- H225 — Highly flammable liquid and vapour
- H301 — Toxic if swallowed
- H311 — Toxic in contact with skin
- H331 — Toxic if inhaled
- H314 — Causes severe skin burns and eye damage
Customs & Trade Information
| HS Code | 2914190090 |
|---|---|
| Summary | 2914190090 other acyclic ketones without other oxygen function。Supervision conditions:None。VAT:17.0%。Tax rebate rate:9.0%。MFN tariff:5.5%。General tariff:30.0% |
Frequently Asked Questions
What is the CAS number of 1-Penten-3-one?
The CAS number of 1-Penten-3-one is 1629-58-9.
What are the molecular formula and molecular weight of 1-Penten-3-one?
1-Penten-3-one has molecular formula C5H8O and molecular weight 84.116 g/mol.
Is 1-Penten-3-one hazardous?
1-Penten-3-one has GHS signal word Danger and hazard statements H225 — Highly flammable liquid and vapour; H301 — Toxic if swallowed; H311 — Toxic in contact with skin.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "1-Penten-3-one (CAS 1629-58-9)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-29257-5 (accessed 2026-11-07).
Data for reference only; verify product details with suppliers before purchase.