2,3-Butanedione
Also known as: diacetyl, biacetyl, butane-2,3-dione, dimethylglyoxal, 2,3-diketobutane, butanedione, 2,3-Butadione, 2,3-Butandione
2,3-Butanedione (CAS 431-03-8) is a compound in the Ketones category listed in the Jingsj chemical database. It has the molecular formula C4H6O2 and a molecular weight of 86.089 g/mol. Key properties include a melting point of -4--2 °C, a boiling point of 88.0±0.0 °C at 760 mmHg, a density of 1.0±0.1 g/cm3 and a flash point of 7.2±0.0 °C. It is classified under GHS with signal word Danger and hazard statements H225 — Highly flammable liquid and vapour, H302 — Harmful if swallowed and H315 — Causes skin irritation. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 431-03-8
- Jingsj CID
- J-1104306-5
- Molecular Formula
- C4H6O2
- Molecular Weight
- 86.089 g/mol
- Category
- Ketones
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | -4--2 °C |
|---|---|
| Boiling Point | 88.0±0.0 °C at 760 mmHg |
| Density | 1.0±0.1 g/cm3 |
| Flash Point | 7.2±0.0 °C |
| Exact Mass | 86.036781 |
| PSA | 34.14000 |
| LogP | -1.33 |
| Additional Property | 3 (vs air) |
| Vapor Pressure | 62.3±0.1 mmHg at 25°C |
| Refractive Index | 1.381 |
| Additional Property | 200 g/L (20 ºC) |
GHS Safety & Compliance
- H225 — Highly flammable liquid and vapour
- H302 — Harmful if swallowed
- H315 — Causes skin irritation
- H318 — Causes serious eye damage
- H331 — Toxic if inhaled
- 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 2,3-Butanedione?
The CAS number of 2,3-Butanedione is 431-03-8.
What are the molecular formula and molecular weight of 2,3-Butanedione?
2,3-Butanedione has molecular formula C4H6O2 and molecular weight 86.089 g/mol.
Is 2,3-Butanedione hazardous?
2,3-Butanedione has GHS signal word Danger and hazard statements H225 — Highly flammable liquid and vapour; H302 — Harmful if swallowed; H315 — Causes skin irritation.
What are the upstream and downstream products of 2,3-Butanedione?
For 2,3-Butanedione, Upstream Products: But-2-yne, Ethanol, Acetoin; Downstream Products: 2,3-Dimethylpyrido[3,4-b]pyrazin-8-amine, 6,7-dimethoxy-2,3-dimethylquinoxaline, 2,3-Dimethoxy-1,3-butadiene.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "2,3-Butanedione (CAS 431-03-8)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1104306-5 (accessed 2026-11-07).
Data for reference only; verify product details with suppliers before purchase.