Methyl 4-methyl-3-oxopentanoate

异丁酰乙酸甲酯

Also known as: Methyl isobutyrylacetate, Isobutyrylacetic acid methyl ester, 4-Methyl-3-oxovaleric acid methyl ester, Methyl 4-methyl-3-oxovalerate, Methyl 3-oxoisocaproate, Pentanoic acid, 4-methyl-3-oxo-, methyl ester, IBEM, MIBA, Methyl isobutyrylacetate for synthesis, EINECS 418-900-0, MFCD00040499

Methyl 4-methyl-3-oxopentanoate (CAS 42558-54-3) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C7H12O3 and a molecular weight of 144.168 g/mol. It is also known as Methyl isobutyrylacetate, Isobutyrylacetic acid methyl ester and 4-Methyl-3-oxovaleric acid methyl ester. Key properties include a melting point of -75°C, a boiling point of 185.8±8.0 °C at 760 mmHg, a density of 1.0±0.1 g/cm3 and a flash point of 68.9±18.5 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 42558-54-3
Jingsj CID: J-48749-2
Molecular Formula: C₇H₁₂O₃
Chinese Name: 异丁酰乙酸甲酯
Molecular Weight: 144.168 g/mol
Category: Organic Acids
Last updated: 8/21/2026

No offers for this compound yet.

Request a quote

Physicochemical Properties

Melting Point	-75°C
Boiling Point	185.8±8.0 °C at 760 mmHg
Density	1.0±0.1 g/cm3
Flash Point	68.9±18.5 °C

Frequently Asked Questions

What is the CAS number of Methyl 4-methyl-3-oxopentanoate?

The CAS number of Methyl 4-methyl-3-oxopentanoate is 42558-54-3.

What are the molecular formula and molecular weight of Methyl 4-methyl-3-oxopentanoate?

Methyl 4-methyl-3-oxopentanoate has molecular formula C7H12O3 and molecular weight 144.168 g/mol.

Data compiled from public chemical databases and supplier catalogs; supplier offers are provided by suppliers.

Last updated: 8/21/2026

How to cite: Jingsj. "Methyl 4-methyl-3-oxopentanoate (CAS 42558-54-3)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-48749-2 (accessed 2026-10-22).

Data for reference only; verify specifications, grades and regulatory status with suppliers before purchase.