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Impurities and reference standards

Mesityl oxide

Also known as 4-Methylpent-3-en-2-one, 4-Methyl-3-penten-2-one, Isopropylideneacetone

CAS 141-79-7Formula C6H10OMolar mass 98.15 g/molEC 205-502-5
GHS signal word: Warning. Pictograms: Flammable, Harmful or irritant 23 suppliers listed
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Mesityl oxide chemical structure, C6H10O, CAS 141-79-7
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Oily, colorless to light-yellow liquid
Melting point
-59 °C
Boiling point
130 °C
Density
0.87 g/cm³
Flash point
31 °C
HS code
291419
Category
Impurities and reference standards
UN number
UN 1229
Illustrative photo, clear liquid in a volumetric flask on a laboratory bench
Typical packagingIllustrative packaging image, not the actual product

What is Mesityl oxide?

Plain description, key identifiers and synonyms

4-Methyl-3-penten-2-one, 9CI is an olefinic compound. It is functionally related to an acrylic acid.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
4-methylpent-3-en-2-one
CAS number
141-79-7 CAS number cross-checked
EC number
205-502-5
Molecular formula
C6H10O
UNII
77LAC84669
MDL number
MFCD00008900
INCI name
4-METHYLPENT-3-EN-2-ONE
InChIKey
SHOJXDKTYKFBRD-UHFFFAOYSA-N
InChI
InChI=1S/C6H10O/c1-5(2)4-6(3)7/h4H,1-3H3
SMILES (canonical and isomeric)
CC(=CC(=O)C)C

Synonyms

  • 4-Methylpent-3-en-2-one
  • 4-Methyl-3-penten-2-one
  • Isopropylideneacetone
  • Methyl isobutenyl ketone
  • 3-Penten-2-one, 4-methyl-
  • Isobutenyl methyl ketone
  • Mesityloxid
  • Mesityloxyde
  • Ossido di mesitile
  • 3-Isohexen-2-one
  • Oxyde de mesityle
  • Methyl 2-methyl-1-propenyl ketone
  • Acetone, isopropylidene-
  • Methyl 2,2-dimethylvinyl ketone
  • 2-Methyl-4-oxo-2-pentene
  • 2-Methyl-2-pentenone-4
  • 4-Metil-3-penten-2-one
  • 2,2-Dimethylvinyl methyl ketone
  • 2-Methyl-2-penten-4-one
  • 4-Methyl-3-pentene-2-one
  • 4-Methyl-3-penten-2-on
  • 4-Methyl-3-penten-2-one, 9CI
  • Isopropylidene acetone
  • Cilastatin EP Impurity D
  • 4-methyl-pent-3-en-2-one
Show all 32 synonyms
  • (CH3)2C=CHC(=O)CH3
  • 4-Methylpent-3-en-2-one, Mesityl oxide, Cilastatin Sodium Imp. D (EP)
  • Mesityl oxide CRS
  • Mesityloxid(german)
  • Isopropylidene-Acetone
  • Teicoplanin EP Impurity A
  • 2-methylpent-2-en-4-one

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

Appearance
Oily, colorless to light-yellow liquidexp.
Odour
Spearmintexp.
Taste
OILY TASTEexp.
Melting point
-59 °Cexp.
Boiling point
130 °Cexp.
Density
0.87 g/cm³exp.
Flash point
31 °Cexp.
Autoignition temperature
344 °Cexp.
Solubility
Sol in about 30 parts water, miscible with most org liqexp.
Vapour pressure
8.21 mm Hg at 25 °Cexp.

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
1calc.
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
GHS07: Harmful or irritant
Harmful or irritant
331NFPA 704 rating

Hazard statements

  • H226Flammable liquid and vapour.
  • H302Harmful if swallowed.
  • H312Harmful in contact with skin.
  • H332Harmful if inhaled.
Precautionary statements (22)
  • 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.
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P264Wash skin thoroughly after handling.
  • P270Do not eat, drink or smoke when using this product.
  • P271Use only outdoors or in a well-ventilated area.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P301 + P317If swallowed: Get medical help.
  • P302 + P352If on skin: Wash with plenty of water.
  • P303 + P361 + P353If on skin (or hair): Take off immediately all contaminated clothing. Rinse skin with water or shower.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P317Get medical help.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P330Rinse mouth.
  • P362 + P364Take off contaminated clothing. And wash it before reuse.
  • 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.
UN number
UN 1229
Transport hazard class
3
Packing group
III

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

Mesityl oxide suppliers

Sponsored listings first, then the documented ranking: membership, verification, replies, completeness, freshness and ratings

All 23 suppliers
23 of 23 offers

Suppliers marked Unclaimed profile have not claimed their profile yet. They are not verified by CompoundList, their offers are price on request and details may have changed, so please confirm them with the supplier. Company representatives can claim a profile with a business email on the company's own website domain. Our team verifies each claim and sends the result by email.

Where suppliers are based

23 suppliers in 7 countries

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Mesityl oxide 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

Solvent for nitrocellulose, many gums and resins, particularly vinyl resins. In lacquers, varnishes and enamels. In making methyl isobutyl ketone.

In leather industries, in ore flotation, as organic intermediate.

Synthetic flavor ingredient.

Solvent for rubbers, vinyl chloride-vinyl acetate copolymers, cellulose resins, oils, gums, ink, & lacquers, component of paint and varnish removers, chem intermediate for methyl isobutyl ketone.

Cosmetic ingredient, INCI name 4-METHYLPENT-3-EN-2-ONE(perfuming)

Functional uses

  • Flavouring and nutrient
  • Fragrance
  • Solvent

Cosmetic functions

  • Perfuming

How it is made

Dehydration of acetone or diacetone alcohol.

Made by distilling diacetone alcohol with a small amount of iodine, ... condensation of acetone to mesityl oxide using sulfonated polystyrene-divinylbenzene resin as ion exchange catalyst.

Regulatory status

Inventories, regulations and trade controls that list this substance

Europe

  • EU harmonised classification (CLP Annex VI)
    Index no: 606-009-00-1

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 Mesityl oxide 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 Mesityl oxide is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Mesityl oxide, based on the data on this page

What is Mesityl oxide?

4-Methyl-3-penten-2-one, 9CI is an olefinic compound. It is functionally related to an acrylic acid.

What is the CAS number of Mesityl oxide?

The CAS registry number of Mesityl oxide is 141-79-7.

What is the molecular formula and weight of Mesityl oxide?

The molecular formula of Mesityl oxide is C6H10O and its molar mass is 98.15 g/mol.

What is Mesityl oxide used for?

Solvent for nitrocellulose, many gums and resins, particularly vinyl resins. In lacquers, varnishes and enamels. In making methyl isobutyl ketone. In leather industries, in ore flotation, as organic intermediate. Synthetic flavor ingredient.

Is Mesityl oxide hazardous?

Mesityl oxide carries the GHS signal word "Warning". Main hazards: flammable liquid and vapour, harmful if swallowed, harmful in contact with skin. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Mesityl oxide?

Mesityl oxide 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 Mesityl oxide?

CompoundList lists 23 suppliers of Mesityl oxide in India, China, Germany, United States and 3 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Mesityl oxide in India?

9 suppliers in India list Mesityl oxide on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of Mesityl oxide?

Suppliers quote Mesityl oxide 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 Mesityl oxide

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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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