2-Hexanone

Also known as: Hexan-2-one, Butyl methyl ketone, Methyl butyl ketone, Methyl n-butyl ketone, MBK, MNBK, n-Butyl methyl ketone, 2-Ketohexane, 2-Oxohexane, Propylacetone

2-Hexanone (CAS 591-78-6) is a compound in the Ketones category listed in the Jingsj chemical database. It has the molecular formula C6H12O and a molecular weight of 100.159 g/mol. Key properties include a melting point of -57 °C, a boiling point of 127.8±3.0 °C at 760 mmHg, a density of 0.8±0.1 g/cm3 and a flash point of 35.0±0.0 °C. It is classified under GHS with signal word Danger and hazard statements H226 — Flammable liquid and vapour, H336 — May cause drowsiness or dizziness and H372 — Causes damage to organs through prolonged exposure. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 591-78-6
Jingsj CID: J-1313126-7
Molecular Formula: C₆H₁₂O
Molecular Weight: 100.159 g/mol
Category: Ketones
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	-57 °C
Boiling Point	127.8±3.0 °C at 760 mmHg
Density	0.8±0.1 g/cm3
Flash Point	35.0±0.0 °C
Exact Mass	100.088814
PSA	17.07000
LogP	1.44
Vapor Pressure	13.3±0.2 mmHg at 25°C
Refractive Index	1.395
Additional Property	2 g/100 mL (20 ºC)

GHS Safety & Compliance

Flammable / Irritant / Health HazardSignal word: Danger

H226 — Flammable liquid and vapour
H336 — May cause drowsiness or dizziness
H372 — Causes damage to organs through prolonged exposure

Frequently Asked Questions

What is the CAS number of 2-Hexanone?

The CAS number of 2-Hexanone is 591-78-6.

What are the molecular formula and molecular weight of 2-Hexanone?

2-Hexanone has molecular formula C6H12O and molecular weight 100.159 g/mol.

Is 2-Hexanone hazardous?

2-Hexanone has GHS signal word Danger and hazard statements H226 — Flammable liquid and vapour; H336 — May cause drowsiness or dizziness; H372 — Causes damage to organs through prolonged exposure.

What are the upstream and downstream products of 2-Hexanone?

For 2-Hexanone, Upstream Products: Hex-1-yne, 2-Hexanol, 1-hexene; Downstream Products: 2-Bromohexane, 2,4,6-Triphenylpyrylium chloride, 2-chloro-2-methylhexane.

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

Last updated: 8/21/2026

How to cite: Jingsj. "2-Hexanone (CAS 591-78-6)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1313126-7 (accessed 2026-11-06).

Data for reference only; verify product details with suppliers before purchase.