3-Butyn-2-one
Also known as: 1-Butyn-3-one, 1-Butyne-3-one, 3-Butyne-2-one, Acetylacetylene, Acetylethyne, Ethynyl methyl ketone, Methyl ethynyl ketone, but-3-yn-2-one, butyn-2-one
3-Butyn-2-one (CAS 1423-60-5) is a compound in the Ketones category listed in the Jingsj chemical database. It has the molecular formula C4H4O and a molecular weight of 68.074 g/mol. Key properties include a boiling point of 85 ºC, a density of 0.87 and a flash point of -1.1±0.0 °C. It is classified under GHS with signal word Danger and hazard statements H225 — Highly flammable liquid and vapour, H300 and H315 — Causes skin irritation. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 1423-60-5
- Jingsj CID
- J-47322-3
- Molecular Formula
- C4H4O
- Molecular Weight
- 68.074 g/mol
- Category
- Ketones
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Boiling Point | 85 ºC |
|---|---|
| Density | 0.87 |
| Flash Point | -1.1±0.0 °C |
| Exact Mass | 68.026215 |
| PSA | 17.07000 |
| LogP | 0.44 |
| Vapor Pressure | 70.6±0.2 mmHg at 25°C |
| Refractive Index | 1.4045-1.4095 |
GHS Safety & Compliance
- H225 — Highly flammable liquid and vapour
- H300
- 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-Butyn-2-one?
The CAS number of 3-Butyn-2-one is 1423-60-5.
What are the molecular formula and molecular weight of 3-Butyn-2-one?
3-Butyn-2-one has molecular formula C4H4O and molecular weight 68.074 g/mol.
Is 3-Butyn-2-one hazardous?
3-Butyn-2-one has GHS signal word Danger and hazard statements H225 — Highly flammable liquid and vapour; H300; 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-Butyn-2-one (CAS 1423-60-5)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-47322-3 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.