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Synthetic aroma chemicals

5-Hexene-2-one

Also known as 5-Hexen-2-one, hex-5-en-2-one, Allylacetone

CAS 109-49-9Formula C6H10OMolar mass 98.15 g/molEC 203-675-1
GHS signal word: Warning. Pictograms: Flammable 4 suppliers listed
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5-Hexene-2-one chemical structure, C6H10O, CAS 109-49-9
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
109-49-9
Formula
C6H10O
Molar mass
98.15 g/mol
Physical form
Liquid
HS code
291419
Category
Synthetic aroma chemicals
Illustrative photo, closed amber glass reagent bottles on a laboratory bench
Typical packagingIllustrative packaging image, not the actual product

What is 5-Hexene-2-one?

Plain description, key identifiers and synonyms

5-hexen-2-one is a ketone.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
hex-5-en-2-one
CAS number
109-49-9 CAS number cross-checked
EC number
203-675-1
Molecular formula
C6H10O
UNII
XWM6RL9YEI
MDL number
MFCD00008793
INCI name
5-HEXEN-2-ONE
InChIKey
RNDVGJZUHCKENF-UHFFFAOYSA-N
InChI
InChI=1S/C6H10O/c1-3-4-5-6(2)7/h3H,1,4-5H2,2H3
SMILES (canonical and isomeric)
CC(=O)CCC=C

Synonyms

  • 5-Hexen-2-one
  • hex-5-en-2-one
  • Allylacetone
  • 1-Hexen-5-one
  • 3-Buten-1-yl Methyl Ketone
  • Allyl acetone
  • 1-hexene-5-one
  • 5-oxo-1-hexene
  • 5-hexen-1-one
  • 5-Hexen-2-one, 99%
  • 5-Hexen-1-one Solution in Acetone, 100ug/mL
  • 5-Hexen-1-one Solution in Acetone, 1000ug/mL

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

Physical form
Liquidexp.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
98.15 g/molcalc.
Exact mass
98.0732 Dacalc.
LogP (octanol/water)
1.54calc.
Topological polar surface area
17.07 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
1calc.
Rotatable bonds
3calc.
Heavy atoms
7calc.
Rings
0calc.
Aromatic rings
0calc.
Fraction sp3 carbons
0.5calc.
Formal charge
0calc.
Stereocentres
0calc.
Lipinski rule of five
Passes (0 violations)calc.

Calculated for screening. Confirm critical figures with the supplier.

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Warning
GHS02: Flammable
Flammable

Hazard statements

  • H226Flammable liquid and vapour.
Precautionary statements (11)
  • P210Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.
  • P233Keep container tightly closed.
  • P240Ground and bond container and receiving equipment.
  • P241Use explosion-proof electrical, ventilating and lighting equipment.
  • P242Use non-sparking tools.
  • P243Take action to prevent static discharges.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P303 + P361 + P353If on skin (or hair): Take off immediately all contaminated clothing. Rinse skin with water or shower.
  • P370 + P378In case of fire: Use appropriate media to extinguish.
  • P403 + P235Store in a well-ventilated place. Keep cool.
  • P501Dispose of contents and container in accordance with local regulations.

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Full safety data and first aid

5-Hexene-2-one suppliers

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Where suppliers are based

4 suppliers in 2 countries

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5-Hexene-2-one price

Indicative price range per kg from live supplier offers

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Uses and applications

What the substance is used for, by industry and function

Cosmetic ingredient, INCI name 5-HEXEN-2-ONE(perfuming)

Functional uses

  • Flavouring and nutrient
  • Fragrance

Cosmetic functions

  • Perfuming

Regulatory status

Inventories, regulations and trade controls that list this substance

Health and food

  • EU cosmetic ingredient inventory

United States

  • TSCA inventory (USA)
    Status: Active in US commerce

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code 5-Hexene-2-one is traded under.

HS 2914.19Indicative HS code

Acyclic ketones without other oxygen function, other

World exports in 2024
$264M
+1.7% vs 2023, imports $308M
2019 to 2024
Top exporters
  1. China27.1%
  2. United States27.0%
  3. Germany10.5%
Top importers
  1. China22.8%
  2. United States13.0%
  3. India * partner reported10.7%

* Partner reported figures, a lower bound.

Reported customs values in USD, not prices.Full trade data

The HS code shown for 5-Hexene-2-one is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about 5-Hexene-2-one, based on the data on this page

What is 5-Hexene-2-one?

5-hexen-2-one is a ketone.

What is the CAS number of 5-Hexene-2-one?

The CAS registry number of 5-Hexene-2-one is 109-49-9.

What is the molecular formula and weight of 5-Hexene-2-one?

The molecular formula of 5-Hexene-2-one is C6H10O and its molar mass is 98.15 g/mol.

What is 5-Hexene-2-one used for?

Known uses and roles of 5-Hexene-2-one include fragrance ingredients in cosmetics and personal care, fragrance ingredients in flavors and fragrances, aldehydes and ketones in flavors and fragrances, perfuming, flavouring and nutrient and 1 more.

Is 5-Hexene-2-one hazardous?

5-Hexene-2-one carries the GHS signal word "Warning". Main hazards: flammable liquid and vapour. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of 5-Hexene-2-one?

5-Hexene-2-one is usually classified under HS code 291419 (Acyclic ketones without other oxygen function, other). This is indicative, confirm it with your customs broker before shipping.

Where can I buy 5-Hexene-2-one?

CompoundList lists 4 suppliers of 5-Hexene-2-one in China and United States. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

What is the price of 5-Hexene-2-one?

Suppliers quote 5-Hexene-2-one on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle 5-Hexene-2-one

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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