3-Penten-2-one
Also known as: (E)-3-Penten-2-one, Methyl propenyl ketone, Ethylidene acetone, Methyl 1-propenyl ketone, 1-Propenyl methyl ketone, 2-Oxo-3-pentene, 2-Penten-4-one, 3-Pentene-2-one, FEMA 3417, Pent-3-en-2-one, ethylideneacetone, pent-3-en-2-one
3-Penten-2-one (CAS 625-33-2) 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 122.0±0.0 °C at 760 mmHg, a density of 0.8±0.1 g/cm3 and a flash point of 21.1±0.0 °C. It is classified under GHS with signal word Danger and hazard statements H225 — Highly flammable liquid and vapour, H311 — Toxic in contact with skin and H315 — Causes skin irritation. It is listed by 2 suppliers, 1 of which publish reference prices, from 11.60 to 18.00 CNY. Record last updated Aug 21, 2026.
- CAS No.
- 625-33-2
- Jingsj CID
- J-13764-1
- Molecular Formula
- C5H8O
- Molecular Weight
- 84.116 g/mol
- Category
- Ketones
- Last updated
- 8/21/2026
| Supplier | Purity / Pack | Base Price | Unit Price | Origin | |
|---|---|---|---|---|---|
In Stock | 98% 500g | ¥5,800.00 | $1.74 /gBest ¥11.60/g CNY | CN China MOQ 500g | |
In Stock | 98% 100g | ¥1,280.00 | $1.92 /g ¥12.80/g CNY | CN China MOQ 100g | |
In Stock | 98% 25g | ¥420.00 | $2.51 /g ¥16.80/g CNY | CN China MOQ 25g |
Physicochemical Properties
| Boiling Point | 122.0±0.0 °C at 760 mmHg |
|---|---|
| Density | 0.8±0.1 g/cm3 |
| Flash Point | 21.1±0.0 °C |
| Exact Mass | 84.057518 |
| PSA | 17.07000 |
| LogP | 0.56 |
| Vapor Pressure | 14.2±0.2 mmHg at 25°C |
| Refractive Index | 1.411 |
| Additional Property | Slightly soluble in Water |
GHS Safety & Compliance
- H225 — Highly flammable liquid and vapour
- H311 — Toxic in contact with skin
- H315 — Causes skin irritation
- H319 — Causes serious eye irritation
- H335 — May cause respiratory irritation
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 3-Penten-2-one?
The CAS number of 3-Penten-2-one is 625-33-2.
What are the molecular formula and molecular weight of 3-Penten-2-one?
3-Penten-2-one has molecular formula C5H8O and molecular weight 84.116 g/mol.
Which suppliers offer 3-Penten-2-one?
2 supplier(s) listed; reference unit price ¥11.60–18.00 /g.
Is 3-Penten-2-one hazardous?
3-Penten-2-one has GHS signal word Danger and hazard statements H225 — Highly flammable liquid and vapour; H311 — Toxic in contact with skin; H315 — Causes skin 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. "3-Penten-2-one (CAS 625-33-2)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-13764-1 (accessed 2026-11-06).
Data for reference only; verify product details with suppliers before purchase.