3-Methyl-3-buten-2-one
Also known as: Methyl isopropenyl ketone, Isopropenyl methyl ketone, 2-Methyl-1-butene-3-one, 3-Methylene-2-butanone, 3-Methylbut-3-en-2-one
3-Methyl-3-buten-2-one (CAS 814-78-8) 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 melting point of -54°C, a boiling point of 98.0±0.0 °C at 760 mmHg, a density of 0.8±0.1 g/cm3 and a flash point of 11.0±11.9 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 814-78-8
- Jingsj CID
- J-11130-8
- 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
| Melting Point | -54°C |
|---|---|
| Boiling Point | 98.0±0.0 °C at 760 mmHg |
| Density | 0.8±0.1 g/cm3 |
| Flash Point | 11.0±11.9 °C |
| Exact Mass | 84.057518 |
| PSA | 17.07000 |
| LogP | 0.59 |
| Vapor Pressure | 40.7±0.1 mmHg at 25°C |
| Refractive Index | 1.397 |
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-Methyl-3-buten-2-one?
The CAS number of 3-Methyl-3-buten-2-one is 814-78-8.
What are the molecular formula and molecular weight of 3-Methyl-3-buten-2-one?
3-Methyl-3-buten-2-one has molecular formula C5H8O and molecular weight 84.116 g/mol.
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-Methyl-3-buten-2-one (CAS 814-78-8)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-11130-8 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.