2,4-Pentanedione
Also known as: Acetylacetone, Acac, Diacetylmethane, 2,4-Dioxopentane, 2,4-Pentadione, Pentane-2,4-dione, Acetoacetone
2,4-Pentanedione (CAS 123-54-6) is a compound in the Solvents category listed in the Jingsj chemical database. It has the molecular formula C5H8O2 and a molecular weight of 100.116 g/mol. Key properties include a melting point of -23 °C, a boiling point of 138.4±13.0 °C at 760 mmHg, a density of 1.0±0.1 g/cm3 and a flash point of 43.1±16.8 °C. It is classified under GHS with signal word Danger and hazard statements H226 — Flammable liquid and vapour, H302 — Harmful 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.
- 123-54-6
- Jingsj CID
- J-1104683-3
- Molecular Formula
- C5H8O2
- Molecular Weight
- 100.116 g/mol
- Category
- Solvents
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | -23 °C |
|---|---|
| Boiling Point | 138.4±13.0 °C at 760 mmHg |
| Density | 1.0±0.1 g/cm3 |
| Flash Point | 43.1±16.8 °C |
| Exact Mass | 100.052429 |
| PSA | 34.14000 |
| LogP | 0.34 |
| Additional Property | 3.5 (vs air) |
| Vapor Pressure | 6.7±0.3 mmHg at 25°C |
| Refractive Index | 1.395 |
| Additional Property | 16 g/100 mL (20 ºC) |
GHS Safety & Compliance
- H226 — Flammable liquid and vapour
- H302 — Harmful if swallowed
- H311 — Toxic in contact with skin
- H331 — Toxic if inhaled
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 2,4-Pentanedione?
The CAS number of 2,4-Pentanedione is 123-54-6.
What are the molecular formula and molecular weight of 2,4-Pentanedione?
2,4-Pentanedione has molecular formula C5H8O2 and molecular weight 100.116 g/mol.
Is 2,4-Pentanedione hazardous?
2,4-Pentanedione has GHS signal word Danger and hazard statements H226 — Flammable liquid and vapour; H302 — Harmful if swallowed; H311 — Toxic in contact with skin.
What are the upstream and downstream products of 2,4-Pentanedione?
For 2,4-Pentanedione, Upstream Products: Ethyl acetate, 4-Hydroxy-6-methyl-2-pyrone, Acetylene; Downstream Products: Pyrimido[1,2-a]benzimidazol-2-amine, 4-methyl- (9CI), 2-Amino-4,6-dimethylnicotinic acid, 3,4-Diacetyl-2,5-hexanedione.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "2,4-Pentanedione (CAS 123-54-6)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1104683-3 (accessed 2026-11-06).
Data for reference only; verify product details with suppliers before purchase.