Methyl acetoacetate
Also known as: Methyl 3-oxobutanoate, Acetoacetic acid methyl ester, Methyl 3-oxobutyrate, 3-Oxobutyric acid methyl ester, Butanoic acid, 3-oxo-, methyl ester, 3-Oxobutanoic acid methyl ester
Methyl acetoacetate (CAS 105-45-3) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C5H8O3 and a molecular weight of 116.115 g/mol. Key properties include a melting point of -28 °C, a boiling point of 169.4±8.0 °C at 760 mmHg, a density of 1.0±0.1 g/cm3 and a flash point of 61.6±18.5 °C. It is classified under GHS with signal word Warning and hazard statements H319 — Causes serious eye irritation. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 105-45-3
- Jingsj CID
- J-30609-2
- Molecular Formula
- C5H8O3
- Molecular Weight
- 116.115 g/mol
- Category
- Organic Acids
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | -28 °C |
|---|---|
| Boiling Point | 169.4±8.0 °C at 760 mmHg |
| Density | 1.0±0.1 g/cm3 |
| Flash Point | 61.6±18.5 °C |
| Exact Mass | 116.047340 |
| PSA | 43.37000 |
| LogP | 0.19 |
| Vapor Pressure | 1.5±0.3 mmHg at 25°C |
| Refractive Index | 1.399 |
| Additional Property | 460 g/L (20 ºC) |
GHS Safety & Compliance
- H319 — Causes serious eye irritation
Customs & Trade Information
| HS Code | 2918300090 |
|---|---|
| Summary | 2918300090 other carboxylic acids with aldehyde or ketone function but without other oxygen function, their anhydrides, halides, peroxides, peroxyacids and their derivatives。Supervision conditions:None。VAT:17.0%。Tax rebate rate:9.0%。MFN tariff:6.5%。General tariff:30.0% |
Frequently Asked Questions
What is the CAS number of Methyl acetoacetate?
The CAS number of Methyl acetoacetate is 105-45-3.
What are the molecular formula and molecular weight of Methyl acetoacetate?
Methyl acetoacetate has molecular formula C5H8O3 and molecular weight 116.115 g/mol.
Is Methyl acetoacetate hazardous?
Methyl acetoacetate has GHS signal word Warning and hazard statements H319 — Causes serious eye irritation.
What are the upstream and downstream products of Methyl acetoacetate?
For Methyl acetoacetate, Upstream Products: Diketene, Methanol, tert-Butyl acetoacetate; Downstream Products: 6,10-Dimethyl-5,9-undecadien-2-one, Pseudoionone.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "Methyl acetoacetate (CAS 105-45-3)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-30609-2 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.